| // |
| // Copyright 2020 The ANGLE Project Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| // ClipDistanceTest.cpp: Test cases for GL_APPLE_clip_distance/GL_EXT_clip_cull_distance extension. |
| // |
| |
| #include "test_utils/ANGLETest.h" |
| #include "test_utils/gl_raii.h" |
| #include "util/EGLWindow.h" |
| #include "util/test_utils.h" |
| |
| using namespace angle; |
| |
| class ClipDistanceTest : public ANGLETest |
| { |
| protected: |
| ClipDistanceTest() |
| { |
| setWindowWidth(16); |
| setWindowHeight(16); |
| setConfigRedBits(8); |
| setConfigGreenBits(8); |
| setConfigBlueBits(8); |
| setConfigAlphaBits(8); |
| setConfigDepthBits(24); |
| } |
| }; |
| |
| // Query max clip distances and enable, disable states of clip distances |
| TEST_P(ClipDistanceTest, StateQuery) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_APPLE_clip_distance")); |
| |
| GLint maxClipDistances = 0; |
| glGetIntegerv(GL_MAX_CLIP_DISTANCES_APPLE, &maxClipDistances); |
| |
| EXPECT_GL_NO_ERROR(); |
| EXPECT_GE(maxClipDistances, 8); |
| |
| GLboolean enabled = glIsEnabled(GL_CLIP_DISTANCE1_APPLE); |
| EXPECT_GL_NO_ERROR(); |
| EXPECT_EQ(enabled, GL_FALSE); |
| |
| glEnable(GL_CLIP_DISTANCE1_APPLE); |
| EXPECT_GL_NO_ERROR(); |
| glEnable(GL_CLIP_DISTANCE7_APPLE); |
| EXPECT_GL_NO_ERROR(); |
| enabled = glIsEnabled(GL_CLIP_DISTANCE1_APPLE); |
| EXPECT_EQ(enabled, GL_TRUE); |
| |
| glDisable(GL_CLIP_DISTANCE1_APPLE); |
| EXPECT_GL_NO_ERROR(); |
| enabled = glIsEnabled(GL_CLIP_DISTANCE1_APPLE); |
| EXPECT_EQ(enabled, GL_FALSE); |
| |
| EXPECT_EQ(glIsEnabled(GL_CLIP_DISTANCE7_APPLE), GL_TRUE); |
| } |
| |
| // Write to one gl_ClipDistance element |
| TEST_P(ClipDistanceTest, OneClipDistance) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_APPLE_clip_distance")); |
| |
| constexpr char kVS[] = R"( |
| #extension GL_APPLE_clip_distance : require |
| |
| uniform vec4 u_plane; |
| |
| attribute vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl1_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| glEnable(GL_CLIP_DISTANCE0_APPLE); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| glUniform4f(glGetUniformLocation(programRed, "u_plane"), 1, 0, 0, 0.5); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be blue |
| for (int x = 0; x < getWindowWidth() / 4 - 1; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::blue); |
| } |
| } |
| |
| // All pixels on the right of the plane x = -0.5 must be red |
| for (int x = getWindowWidth() / 4 + 2; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| } |
| |
| // Clear to green |
| glClearColor(0, 1, 0, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| glUniform4f(glGetUniformLocation(programRed, "u_plane"), -1, 0, 0, -0.5); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be red |
| for (int x = 0; x < getWindowWidth() / 4 - 1; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| } |
| |
| // All pixels on the right of the plane x = -0.5 must be green |
| for (int x = getWindowWidth() / 4 + 2; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::green); |
| } |
| } |
| |
| // Disable GL_CLIP_DISTANCE |
| glDisable(GL_CLIP_DISTANCE0_APPLE); |
| drawQuad(programRed, "a_position", 0); |
| |
| // All pixels must be red |
| for (int x = 0; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| } |
| } |
| |
| // Write to 3 clip distances |
| TEST_P(ClipDistanceTest, ThreeClipDistances) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_APPLE_clip_distance")); |
| |
| constexpr char kVS[] = R"( |
| #extension GL_APPLE_clip_distance : require |
| |
| uniform vec4 u_plane[3]; |
| |
| attribute vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane[0]); |
| gl_ClipDistance[3] = dot(gl_Position, u_plane[1]); |
| gl_ClipDistance[7] = dot(gl_Position, u_plane[2]); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl1_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Enable 3 clip distances |
| glEnable(GL_CLIP_DISTANCE0_APPLE); |
| glEnable(GL_CLIP_DISTANCE3_APPLE); |
| glEnable(GL_CLIP_DISTANCE7_APPLE); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| // x = -0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 1, 0, 0, 0.5); |
| // x = 0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), -1, 0, 0, 0.5); |
| // x + y = 1 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -1, -1, 0, 1); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be blue |
| for (int x = 0; x < getWindowWidth() / 4 - 1; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::blue); |
| } |
| } |
| |
| // All pixels on the right of the plane x = -0.5 must be red, except those in the upper right |
| // triangle |
| for (int x = getWindowWidth() / 4 + 2; x < getWindowWidth() / 2; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| } |
| |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| for (int x = getWindowWidth() / 2; x < getWindowWidth(); ++x) |
| { |
| if (x < getWindowWidth() * 3 / 2 - y - 1 && x < getWindowWidth() * 3 / 4 - 1) |
| { |
| // bottom left triangle clipped by x=0.5 plane |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| else if (x > getWindowWidth() * 3 / 2 - y + 1 || x > getWindowWidth() * 3 / 4 + 1) |
| { |
| // upper right triangle plus right of x=0.5 plane |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::blue); |
| } |
| } |
| } |
| |
| // Clear to green |
| glClearColor(0, 1, 0, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Disable gl_ClipDistance[3] |
| glDisable(GL_CLIP_DISTANCE3_APPLE); |
| |
| // Draw full screen quad with color red |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be green |
| for (int x = 0; x < getWindowWidth() / 4 - 1; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::green); |
| } |
| } |
| |
| // All pixels on the right of the plane x = -0.5 must be red, except those in the upper right |
| // triangle |
| for (int x = getWindowWidth() / 4 + 2; x < getWindowWidth() / 2; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| } |
| |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| for (int x = getWindowWidth() / 2; x < getWindowWidth(); ++x) |
| { |
| if (x < getWindowWidth() * 3 / 2 - y - 1) |
| { |
| // bottom left triangle |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| else if (x > getWindowWidth() * 3 / 2 - y + 1) |
| { |
| // upper right triangle |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::green); |
| } |
| } |
| } |
| } |
| |
| // Redeclare gl_ClipDistance in shader with explicit size, also use it in a global function |
| // outside main() |
| TEST_P(ClipDistanceTest, ThreeClipDistancesRedeclared) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_APPLE_clip_distance")); |
| |
| constexpr char kVS[] = R"( |
| #extension GL_APPLE_clip_distance : require |
| |
| varying highp float gl_ClipDistance[3]; |
| |
| void computeClipDistances(in vec4 position, in vec4 plane[3]) |
| { |
| gl_ClipDistance[0] = dot(position, plane[0]); |
| gl_ClipDistance[1] = dot(position, plane[1]); |
| gl_ClipDistance[2] = dot(position, plane[2]); |
| } |
| |
| uniform vec4 u_plane[3]; |
| |
| attribute vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| computeClipDistances(gl_Position, u_plane); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl1_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Enable 3 clip distances |
| glEnable(GL_CLIP_DISTANCE0_APPLE); |
| glEnable(GL_CLIP_DISTANCE1_APPLE); |
| glEnable(GL_CLIP_DISTANCE2_APPLE); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| // x = -0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 1, 0, 0, 0.5); |
| // x = 0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), -1, 0, 0, 0.5); |
| // x + y = 1 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -1, -1, 0, 1); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be blue |
| for (int x = 0; x < getWindowWidth() / 4 - 1; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::blue); |
| } |
| } |
| |
| // All pixels on the right of the plane x = -0.5 must be red, except those in the upper right |
| // triangle |
| for (int x = getWindowWidth() / 4 + 2; x < getWindowWidth() / 2; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| } |
| |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| for (int x = getWindowWidth() / 2; x < getWindowWidth(); ++x) |
| { |
| if (x < getWindowWidth() * 3 / 2 - y - 1 && x < getWindowWidth() * 3 / 4 - 1) |
| { |
| // bottom left triangle clipped by x=0.5 plane |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::red); |
| } |
| else if (x > getWindowWidth() * 3 / 2 - y + 1 || x > getWindowWidth() * 3 / 4 + 1) |
| { |
| // upper right triangle plus right of x=0.5 plane |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::blue); |
| } |
| } |
| } |
| } |
| |
| class ClipCullDistanceTest : public ClipDistanceTest |
| {}; |
| |
| // Query max clip distances and enable, disable states of clip distances |
| TEST_P(ClipCullDistanceTest, StateQuery) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| GLint maxClipDistances = 0; |
| glGetIntegerv(GL_MAX_CLIP_DISTANCES_EXT, &maxClipDistances); |
| |
| EXPECT_GL_NO_ERROR(); |
| EXPECT_GE(maxClipDistances, 8); |
| |
| GLint maxCullDistances = 0; |
| glGetIntegerv(GL_MAX_CULL_DISTANCES_EXT, &maxCullDistances); |
| |
| EXPECT_GL_NO_ERROR(); |
| EXPECT_GE(maxCullDistances, 8); |
| |
| GLint maxCombinedClipAndCullDistances = 0; |
| glGetIntegerv(GL_MAX_COMBINED_CLIP_AND_CULL_DISTANCES_EXT, &maxCombinedClipAndCullDistances); |
| |
| EXPECT_GL_NO_ERROR(); |
| EXPECT_GE(maxCombinedClipAndCullDistances, 8); |
| |
| GLboolean enabled = glIsEnabled(GL_CLIP_DISTANCE1_EXT); |
| EXPECT_GL_NO_ERROR(); |
| EXPECT_EQ(enabled, GL_FALSE); |
| |
| glEnable(GL_CLIP_DISTANCE1_EXT); |
| EXPECT_GL_NO_ERROR(); |
| glEnable(GL_CLIP_DISTANCE7_EXT); |
| EXPECT_GL_NO_ERROR(); |
| enabled = glIsEnabled(GL_CLIP_DISTANCE1_EXT); |
| EXPECT_EQ(enabled, GL_TRUE); |
| |
| glDisable(GL_CLIP_DISTANCE1_EXT); |
| EXPECT_GL_NO_ERROR(); |
| enabled = glIsEnabled(GL_CLIP_DISTANCE1_EXT); |
| EXPECT_EQ(enabled, GL_FALSE); |
| |
| EXPECT_EQ(glIsEnabled(GL_CLIP_DISTANCE7_EXT), GL_TRUE); |
| } |
| |
| // Check that the validation for EXT_clip_cull_distance extension is correct |
| // If gl_ClipDistance or gl_CullDistance is redeclared in some shader stages, the array size of the |
| // redeclared variables should match |
| TEST_P(ClipCullDistanceTest, SizeCheck) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| // Validate array size match of redeclared ClipDistance built-in |
| constexpr char kVSErrorClipDistance[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| out highp float gl_ClipDistance[1]; |
| |
| uniform vec4 u_plane; |
| |
| in vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane); |
| |
| gl_CullDistance[0] = dot(gl_Position, u_plane); |
| gl_CullDistance[1] = dot(gl_Position, u_plane); |
| })"; |
| |
| constexpr char kFSErrorClipDistance[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| in highp float gl_ClipDistance[2]; |
| precision highp float; |
| out vec4 my_FragColor; |
| void main() |
| { |
| my_FragColor = vec4(gl_ClipDistance[0], gl_ClipDistance[1], gl_CullDistance[0], 1.0f); |
| })"; |
| |
| GLProgram programClipDistance; |
| programClipDistance.makeRaster(kVSErrorClipDistance, kFSErrorClipDistance); |
| EXPECT_GL_FALSE(programClipDistance.valid()); |
| |
| // Validate array size match of redeclared CullDistance built-in |
| constexpr char kVSErrorCullDistance[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| out highp float gl_CullDistance[1]; |
| |
| uniform vec4 u_plane; |
| |
| in vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_CullDistance[0] = dot(gl_Position, u_plane); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane); |
| gl_ClipDistance[1] = dot(gl_Position, u_plane); |
| })"; |
| |
| constexpr char kFSErrorCullDistance[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| in highp float gl_CullDistance[2]; |
| precision highp float; |
| out vec4 my_FragColor; |
| void main() |
| { |
| my_FragColor = vec4(gl_CullDistance[0], gl_CullDistance[1], gl_ClipDistance[0], 1.0f); |
| })"; |
| |
| GLProgram programCullDistance; |
| programCullDistance.makeRaster(kVSErrorCullDistance, kFSErrorCullDistance); |
| EXPECT_GL_FALSE(programCullDistance.valid()); |
| } |
| |
| // Write to one gl_ClipDistance element |
| TEST_P(ClipCullDistanceTest, OneClipDistance) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| constexpr char kVS[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| uniform vec4 u_plane; |
| |
| in vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl3_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| glEnable(GL_CLIP_DISTANCE0_EXT); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| glUniform4f(glGetUniformLocation(programRed, "u_plane"), 1, 0, 0, 0.5); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be blue |
| GLuint x = 0; |
| GLuint y = 0; |
| GLuint width = getWindowWidth() / 4 - 1; |
| GLuint height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::blue); |
| |
| // All pixels on the right of the plane x = -0.5 must be red |
| x = getWindowWidth() / 4 + 2; |
| y = 0; |
| width = getWindowWidth() - x; |
| height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::red); |
| |
| // Clear to green |
| glClearColor(0, 1, 0, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| glUniform4f(glGetUniformLocation(programRed, "u_plane"), -1, 0, 0, -0.5); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be red |
| x = 0; |
| y = 0; |
| width = getWindowWidth() / 4 - 1; |
| height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::red); |
| |
| // All pixels on the right of the plane x = -0.5 must be green |
| x = getWindowWidth() / 4 + 2; |
| y = 0; |
| width = getWindowWidth() - x; |
| height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::green); |
| |
| // Disable GL_CLIP_DISTANCE |
| glDisable(GL_CLIP_DISTANCE0_EXT); |
| drawQuad(programRed, "a_position", 0); |
| |
| // All pixels must be red |
| x = 0; |
| y = 0; |
| width = getWindowWidth(); |
| height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::red); |
| } |
| |
| // Write to 3 clip distances |
| TEST_P(ClipCullDistanceTest, ThreeClipDistances) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| constexpr char kVS[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| uniform vec4 u_plane[3]; |
| |
| in vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane[0]); |
| gl_ClipDistance[3] = dot(gl_Position, u_plane[1]); |
| gl_ClipDistance[7] = dot(gl_Position, u_plane[2]); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl3_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Enable 3 clip distances |
| glEnable(GL_CLIP_DISTANCE0_EXT); |
| glEnable(GL_CLIP_DISTANCE3_EXT); |
| glEnable(GL_CLIP_DISTANCE7_EXT); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| // x = -0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 1, 0, 0, 0.5); |
| // x = 0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), -1, 0, 0, 0.5); |
| // x + y = 1 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -1, -1, 0, 1); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be blue |
| GLuint x = 0; |
| GLuint y = 0; |
| GLuint width = getWindowWidth() / 4 - 1; |
| GLuint height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::blue); |
| |
| // All pixels on the right of the plane x = -0.5 must be red, except those in the upper right |
| // triangle |
| x = getWindowWidth() / 4 + 2; |
| y = 0; |
| width = getWindowWidth() / 2 - x; |
| height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::red); |
| |
| std::vector<GLColor> actualColors(getWindowWidth() * getWindowHeight()); |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| for (int x = getWindowWidth() / 2; x < getWindowWidth(); ++x) |
| { |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if (x < getWindowWidth() * 3 / 2 - y - 1 && x < getWindowWidth() * 3 / 4 - 1) |
| { |
| // bottom left triangle clipped by x=0.5 plane |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else if (x > getWindowWidth() * 3 / 2 - y + 1 || x > getWindowWidth() * 3 / 4 + 1) |
| { |
| // upper right triangle plus right of x=0.5 plane |
| EXPECT_EQ(GLColor::blue, actualColors[currentPosition]); |
| } |
| } |
| } |
| |
| // Clear to green |
| glClearColor(0, 1, 0, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Disable gl_ClipDistance[3] |
| glDisable(GL_CLIP_DISTANCE3_EXT); |
| |
| // Draw full screen quad with color red |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be green |
| for (int x = 0; x < getWindowWidth() / 4 - 1; ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| EXPECT_PIXEL_COLOR_EQ(x, y, GLColor::green); |
| } |
| } |
| |
| // All pixels on the right of the plane x = -0.5 must be red, except those in the upper right |
| // triangle |
| x = getWindowWidth() / 4 + 2; |
| y = 0; |
| width = getWindowWidth() / 2 - x; |
| height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::red); |
| |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| for (int x = getWindowWidth() / 2; x < getWindowWidth(); ++x) |
| { |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if (x < getWindowWidth() * 3 / 2 - y - 1) |
| { |
| // bottom left triangle |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else if (x > getWindowWidth() * 3 / 2 - y + 1) |
| { |
| // upper right triangle |
| EXPECT_EQ(GLColor::green, actualColors[currentPosition]); |
| } |
| } |
| } |
| } |
| |
| // Redeclare gl_ClipDistance in shader with explicit size, also use it in a global function |
| // outside main() |
| TEST_P(ClipCullDistanceTest, ThreeClipDistancesRedeclared) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| constexpr char kVS[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| out highp float gl_ClipDistance[3]; |
| |
| void computeClipDistances(in vec4 position, in vec4 plane[3]) |
| { |
| gl_ClipDistance[0] = dot(position, plane[0]); |
| gl_ClipDistance[1] = dot(position, plane[1]); |
| gl_ClipDistance[2] = dot(position, plane[2]); |
| } |
| |
| uniform vec4 u_plane[3]; |
| |
| in vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| computeClipDistances(gl_Position, u_plane); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl3_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Enable 3 clip distances |
| glEnable(GL_CLIP_DISTANCE0_EXT); |
| glEnable(GL_CLIP_DISTANCE1_EXT); |
| glEnable(GL_CLIP_DISTANCE2_EXT); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| // x = -0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 1, 0, 0, 0.5); |
| // x = 0.5 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), -1, 0, 0, 0.5); |
| // x + y = 1 |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -1, -1, 0, 1); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the left of the plane x = -0.5 must be blue |
| GLuint x = 0; |
| GLuint y = 0; |
| GLuint width = getWindowWidth() / 4 - 1; |
| GLuint height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::blue); |
| |
| // All pixels on the right of the plane x = -0.5 must be red, except those in the upper right |
| // triangle |
| x = getWindowWidth() / 4 + 2; |
| y = 0; |
| width = getWindowWidth() / 2 - x; |
| height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::red); |
| |
| std::vector<GLColor> actualColors(getWindowWidth() * getWindowHeight()); |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| for (int x = getWindowWidth() / 2; x < getWindowWidth(); ++x) |
| { |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if (x < getWindowWidth() * 3 / 2 - y - 1 && x < getWindowWidth() * 3 / 4 - 1) |
| { |
| // bottom left triangle clipped by x=0.5 plane |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else if (x > getWindowWidth() * 3 / 2 - y + 1 || x > getWindowWidth() * 3 / 4 + 1) |
| { |
| // upper right triangle plus right of x=0.5 plane |
| EXPECT_EQ(GLColor::blue, actualColors[currentPosition]); |
| } |
| } |
| } |
| } |
| |
| // Write to one gl_CullDistance element |
| TEST_P(ClipCullDistanceTest, OneCullDistance) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| constexpr char kVS[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| uniform vec4 u_plane; |
| |
| in vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_CullDistance[0] = dot(gl_Position, u_plane); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl3_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| glUniform4f(glGetUniformLocation(programRed, "u_plane"), 1, 0, 0, 0.5); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels must be red |
| GLuint x = 0; |
| GLuint y = 0; |
| GLuint width = getWindowWidth(); |
| GLuint height = getWindowHeight(); |
| EXPECT_PIXEL_RECT_EQ(x, y, width, height, GLColor::red); |
| |
| // Clear to green |
| glClearColor(0, 1, 0, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Draw full screen quad with color red |
| glUniform4f(glGetUniformLocation(programRed, "u_plane"), 1, 1, 0, 0); |
| EXPECT_GL_NO_ERROR(); |
| drawQuad(programRed, "a_position", 0); |
| EXPECT_GL_NO_ERROR(); |
| |
| // All pixels on the plane y >= -x must be red |
| std::vector<GLColor> actualColors(getWindowWidth() * getWindowHeight()); |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int x = 0; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if ((x + y) >= 0) |
| { |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else |
| { |
| EXPECT_EQ(GLColor::green, actualColors[currentPosition]); |
| } |
| } |
| } |
| } |
| |
| // Write to 4 clip distances |
| TEST_P(ClipCullDistanceTest, FourClipDistances) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| constexpr char kVS[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| in vec2 a_position; |
| uniform vec4 u_plane[4]; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane[0]); |
| gl_ClipDistance[1] = dot(gl_Position, u_plane[1]); |
| gl_ClipDistance[2] = dot(gl_Position, u_plane[2]); |
| gl_ClipDistance[3] = dot(gl_Position, u_plane[3]); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl3_shaders::fs::Red()); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Enable 3 clip distances |
| glEnable(GL_CLIP_DISTANCE0_EXT); |
| glEnable(GL_CLIP_DISTANCE2_EXT); |
| glEnable(GL_CLIP_DISTANCE3_EXT); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Disable 1 clip distances |
| glDisable(GL_CLIP_DISTANCE1_EXT); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| constexpr unsigned int kNumVertices = 12; |
| const std::array<Vector3, kNumVertices> quadVertices = { |
| {Vector3(-1.0f, 1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(1.0f, 1.0f, 0.0f), |
| Vector3(1.0f, 1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(1.0f, -1.0f, 0.0f), |
| Vector3(1.0f, -1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-1.0f, -1.0f, 0.0f), |
| Vector3(-1.0f, -1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-1.0f, 1.0f, 0.0f)}}; |
| |
| GLBuffer vertexBuffer; |
| glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); |
| glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 3 * kNumVertices, quadVertices.data(), |
| GL_STATIC_DRAW); |
| ASSERT_GL_NO_ERROR(); |
| |
| GLint positionLocation = glGetAttribLocation(programRed, "a_position"); |
| glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, 0); |
| ASSERT_GL_NO_ERROR(); |
| |
| glEnableVertexAttribArray(positionLocation); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Draw full screen quad and small size triangle with color red |
| // y <= 1.0f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 0, -1, 0, 1); |
| // y >= 0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), 0, 1, 0, -0.5); |
| // y >= 3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -3, 1, 0, 0.5); |
| // y >= -3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[3]"), 3, 1, 0, 0.5); |
| EXPECT_GL_NO_ERROR(); |
| |
| glDrawArrays(GL_TRIANGLES, 0, kNumVertices); |
| EXPECT_GL_NO_ERROR(); |
| |
| const int windowWidth = getWindowWidth(); |
| const int windowHeight = getWindowHeight(); |
| auto checkLeftPlaneFunc = [windowWidth, windowHeight](int x, int y) -> float { |
| return (3 * (x - (windowWidth / 2 - 1)) - (windowHeight / 4 + 1) + y); |
| }; |
| auto checkRightPlaneFunc = [windowWidth, windowHeight](int x, int y) -> float { |
| return (-3 * (x - (windowWidth / 2)) - (windowHeight / 4 + 1) + y); |
| }; |
| |
| // Only pixels in the triangle must be red |
| std::vector<GLColor> actualColors(getWindowWidth() * getWindowHeight()); |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int x = 0; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| // The drawing method of Swiftshader and Native graphic card is different. So the |
| // compare function doesn't check the value on the line. |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if (checkLeftPlaneFunc(x, y) > 0 && checkRightPlaneFunc(x, y) > 0) |
| { |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else if (checkLeftPlaneFunc(x, y) < 0 || checkRightPlaneFunc(x, y) < 0) |
| { |
| EXPECT_EQ(GLColor::blue, actualColors[currentPosition]); |
| } |
| } |
| } |
| } |
| |
| // Write to 4 cull distances |
| TEST_P(ClipCullDistanceTest, FourCullDistances) |
| { |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance")); |
| |
| // SwiftShader bug: http://anglebug.com/5451 |
| ANGLE_SKIP_TEST_IF(isSwiftshader()); |
| |
| constexpr char kVS[] = R"(#version 300 es |
| #extension GL_EXT_clip_cull_distance : require |
| |
| uniform vec4 u_plane[4]; |
| |
| in vec2 a_position; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_CullDistance[0] = dot(gl_Position, u_plane[0]); |
| gl_CullDistance[1] = dot(gl_Position, u_plane[1]); |
| gl_CullDistance[2] = dot(gl_Position, u_plane[2]); |
| gl_CullDistance[3] = dot(gl_Position, u_plane[3]); |
| })"; |
| |
| ANGLE_GL_PROGRAM(programRed, kVS, essl3_shaders::fs::Red()); |
| glLinkProgram(programRed); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| constexpr unsigned int kNumVertices = 12; |
| const std::array<Vector3, kNumVertices> quadVertices = { |
| {Vector3(-1.0f, 1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(1.0f, 1.0f, 0.0f), |
| Vector3(1.0f, 1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(1.0f, -1.0f, 0.0f), |
| Vector3(1.0f, -1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-1.0f, -1.0f, 0.0f), |
| Vector3(-1.0f, -1.0f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-1.0f, 1.0f, 0.0f)}}; |
| |
| GLBuffer vertexBuffer; |
| glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); |
| glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 3 * kNumVertices, quadVertices.data(), |
| GL_STATIC_DRAW); |
| ASSERT_GL_NO_ERROR(); |
| |
| GLint positionLocation = glGetAttribLocation(programRed, "a_position"); |
| glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, 0); |
| ASSERT_GL_NO_ERROR(); |
| |
| glEnableVertexAttribArray(positionLocation); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Draw full screen quad and small size triangle with color red |
| // y <= 1.0f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 0, -1, 0, 1); |
| // y >= 0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), 0, 1, 0, -0.5); |
| // y >= 3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -3, 1, 0, 0.5); |
| // y >= -3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[3]"), 3, 1, 0, 0.5); |
| EXPECT_GL_NO_ERROR(); |
| |
| glDrawArrays(GL_TRIANGLES, 0, kNumVertices); |
| EXPECT_GL_NO_ERROR(); |
| |
| // Only pixels in the triangle must be red |
| std::vector<GLColor> actualColors(getWindowWidth() * getWindowHeight()); |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int x = 0; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if (y > x || y >= -x + getWindowHeight() - 1) |
| { |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else |
| { |
| EXPECT_EQ(GLColor::blue, actualColors[currentPosition]); |
| } |
| } |
| } |
| } |
| |
| // Verify that EXT_clip_cull_distance works with EXT_geometry_shader |
| TEST_P(ClipCullDistanceTest, ClipDistanceInteractWithGeometryShader) |
| { |
| // TODO: http://anglebug.com/5466 |
| // After implementing EXT_geometry_shader, EXT_clip_cull_distance should be additionally |
| // implemented to support the geometry shader. And then, this skip can be removed. |
| ANGLE_SKIP_TEST_IF(IsVulkan()); |
| |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance") || |
| !IsGLExtensionEnabled("GL_EXT_geometry_shader")); |
| |
| constexpr char kVS[] = R"(#version 310 es |
| #extension GL_EXT_clip_cull_distance : require |
| #extension GL_EXT_geometry_shader : require |
| |
| in vec2 a_position; |
| uniform vec4 u_plane[4]; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_ClipDistance[0] = dot(gl_Position, u_plane[0]); |
| gl_ClipDistance[1] = dot(gl_Position, u_plane[1]); |
| gl_ClipDistance[2] = dot(gl_Position, u_plane[2]); |
| gl_ClipDistance[3] = dot(gl_Position, u_plane[3]); |
| })"; |
| |
| constexpr char kGS[] = R"(#version 310 es |
| #extension GL_EXT_clip_cull_distance : require |
| #extension GL_EXT_geometry_shader : require |
| |
| layout (triangles) in; |
| layout (triangle_strip, max_vertices = 3) out; |
| |
| in gl_PerVertex { |
| highp vec4 gl_Position; |
| highp float gl_ClipDistance[]; |
| } gl_in[]; |
| |
| out gl_PerVertex { |
| highp vec4 gl_Position; |
| highp float gl_ClipDistance[]; |
| }; |
| |
| uniform vec4 u_plane[4]; |
| |
| void GetNewPosition(int i) |
| { |
| gl_Position = 2.0f * gl_in[i].gl_Position; |
| |
| for (int index = 0 ; index < 4 ; index++) |
| { |
| if (gl_in[i].gl_ClipDistance[index] < 0.0f) |
| { |
| gl_ClipDistance[index] = dot(gl_Position, u_plane[index]); |
| } |
| } |
| EmitVertex(); |
| } |
| |
| void main() |
| { |
| for (int i = 0 ; i < 3 ; i++) |
| { |
| GetNewPosition(i); |
| } |
| EndPrimitive(); |
| })"; |
| |
| ANGLE_GL_PROGRAM_WITH_GS(programRed, kVS, kGS, essl31_shaders::fs::Red()); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Enable 3 clip distances |
| glEnable(GL_CLIP_DISTANCE0_EXT); |
| glEnable(GL_CLIP_DISTANCE2_EXT); |
| glEnable(GL_CLIP_DISTANCE3_EXT); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Disable 1 clip distances |
| glDisable(GL_CLIP_DISTANCE1_EXT); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| constexpr unsigned int kNumVertices = 12; |
| const std::array<Vector3, kNumVertices> quadVertices = { |
| {Vector3(-0.5f, 0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(0.5f, 0.5f, 0.0f), |
| Vector3(0.5f, 0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(0.5f, -0.5f, 0.0f), |
| Vector3(0.5f, -0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-0.5f, -0.5f, 0.0f), |
| Vector3(-0.5f, -0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-0.5f, 0.5f, 0.0f)}}; |
| |
| GLBuffer vertexBuffer; |
| glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); |
| glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 3 * kNumVertices, quadVertices.data(), |
| GL_STATIC_DRAW); |
| ASSERT_GL_NO_ERROR(); |
| |
| GLint positionLocation = glGetAttribLocation(programRed, "a_position"); |
| glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, 0); |
| ASSERT_GL_NO_ERROR(); |
| |
| glEnableVertexAttribArray(positionLocation); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Draw full screen quad and small size triangle with color red |
| // y <= 1.0f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 0, -1, 0, 1); |
| // y >= 0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), 0, 1, 0, -0.5); |
| // y >= 3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -3, 1, 0, 0.5); |
| // y >= -3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[3]"), 3, 1, 0, 0.5); |
| EXPECT_GL_NO_ERROR(); |
| |
| glDrawArrays(GL_TRIANGLES, 0, kNumVertices); |
| EXPECT_GL_NO_ERROR(); |
| |
| const int windowWidth = getWindowWidth(); |
| const int windowHeight = getWindowHeight(); |
| auto checkLeftPlaneFunc = [windowWidth, windowHeight](int x, int y) -> float { |
| return (3 * (x - (windowWidth / 2 - 1)) - (windowHeight / 4 + 1) + y); |
| }; |
| auto checkRightPlaneFunc = [windowWidth, windowHeight](int x, int y) -> float { |
| return (-3 * (x - (windowWidth / 2)) - (windowHeight / 4 + 1) + y); |
| }; |
| |
| // Only pixels in the triangle must be red |
| std::vector<GLColor> actualColors(getWindowWidth() * getWindowHeight()); |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int x = 0; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| // The drawing method of Swiftshader and Native graphic card is different. So the |
| // compare function doesn't check the value on the line. |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if (checkLeftPlaneFunc(x, y) > 0 && checkRightPlaneFunc(x, y) > 0) |
| { |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else if (checkLeftPlaneFunc(x, y) < 0 || checkRightPlaneFunc(x, y) < 0) |
| { |
| EXPECT_EQ(GLColor::blue, actualColors[currentPosition]); |
| } |
| } |
| } |
| } |
| |
| // Verify that EXT_clip_cull_distance works with EXT_geometry_shader |
| TEST_P(ClipCullDistanceTest, CullDistanceInteractWithGeometryShader) |
| { |
| // TODO: http://anglebug.com/5466 |
| // After implementing EXT_geometry_shader, EXT_clip_cull_distance should be additionally |
| // implemented to support the geometry shader. And then, this skip can be removed. |
| ANGLE_SKIP_TEST_IF(IsVulkan()); |
| |
| ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_EXT_clip_cull_distance") || |
| !IsGLExtensionEnabled("GL_EXT_geometry_shader")); |
| |
| constexpr char kVS[] = R"(#version 310 es |
| #extension GL_EXT_clip_cull_distance : require |
| #extension GL_EXT_geometry_shader : require |
| |
| in vec2 a_position; |
| uniform vec4 u_plane[4]; |
| |
| void main() |
| { |
| gl_Position = vec4(a_position, 0.0, 1.0); |
| |
| gl_CullDistance[0] = dot(gl_Position, u_plane[0]); |
| gl_CullDistance[1] = dot(gl_Position, u_plane[1]); |
| gl_CullDistance[2] = dot(gl_Position, u_plane[2]); |
| gl_CullDistance[3] = dot(gl_Position, u_plane[3]); |
| })"; |
| |
| constexpr char kGS[] = R"(#version 310 es |
| #extension GL_EXT_clip_cull_distance : require |
| #extension GL_EXT_geometry_shader : require |
| |
| layout (triangles) in; |
| layout (triangle_strip, max_vertices = 3) out; |
| |
| in gl_PerVertex { |
| highp vec4 gl_Position; |
| highp float gl_CullDistance[]; |
| } gl_in[]; |
| |
| out gl_PerVertex { |
| highp vec4 gl_Position; |
| highp float gl_CullDistance[]; |
| }; |
| |
| uniform vec4 u_plane[4]; |
| |
| void GetNewPosition(int i) |
| { |
| gl_Position = 2.0f * gl_in[i].gl_Position; |
| |
| for (int index = 0 ; index < 4 ; index++) |
| { |
| if (gl_in[i].gl_CullDistance[index] < 0.0f) |
| { |
| gl_CullDistance[index] = dot(gl_Position, u_plane[index]); |
| } |
| } |
| EmitVertex(); |
| } |
| |
| void main() |
| { |
| for (int i = 0 ; i < 3 ; i++) |
| { |
| GetNewPosition(i); |
| } |
| EndPrimitive(); |
| })"; |
| |
| ANGLE_GL_PROGRAM_WITH_GS(programRed, kVS, kGS, essl31_shaders::fs::Red()); |
| glUseProgram(programRed); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Clear to blue |
| glClearColor(0, 0, 1, 1); |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| constexpr unsigned int kNumVertices = 12; |
| const std::array<Vector3, kNumVertices> quadVertices = { |
| {Vector3(-0.5f, 0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(0.5f, 0.5f, 0.0f), |
| Vector3(0.5f, 0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(0.5f, -0.5f, 0.0f), |
| Vector3(0.5f, -0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-0.5f, -0.5f, 0.0f), |
| Vector3(-0.5f, -0.5f, 0.0f), Vector3(0.0f, 0.0f, 0.0f), Vector3(-0.5f, 0.5f, 0.0f)}}; |
| |
| GLBuffer vertexBuffer; |
| glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); |
| glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 3 * kNumVertices, quadVertices.data(), |
| GL_STATIC_DRAW); |
| ASSERT_GL_NO_ERROR(); |
| |
| GLint positionLocation = glGetAttribLocation(programRed, "a_position"); |
| glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, 0); |
| ASSERT_GL_NO_ERROR(); |
| |
| glEnableVertexAttribArray(positionLocation); |
| ASSERT_GL_NO_ERROR(); |
| |
| // Draw full screen quad and small size triangle with color red |
| // y <= 1.0f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[0]"), 0, -1, 0, 1); |
| // y >= 0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[1]"), 0, 1, 0, -0.5); |
| // y >= 3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[2]"), -3, 1, 0, 0.5); |
| // y >= -3x-0.5f |
| glUniform4f(glGetUniformLocation(programRed, "u_plane[3]"), 3, 1, 0, 0.5); |
| EXPECT_GL_NO_ERROR(); |
| |
| glDrawArrays(GL_TRIANGLES, 0, kNumVertices); |
| EXPECT_GL_NO_ERROR(); |
| |
| // Only pixels in the triangle must be red |
| std::vector<GLColor> actualColors(getWindowWidth() * getWindowHeight()); |
| glReadPixels(0, 0, getWindowWidth(), getWindowHeight(), GL_RGBA, GL_UNSIGNED_BYTE, |
| actualColors.data()); |
| for (int x = 0; x < getWindowWidth(); ++x) |
| { |
| for (int y = 0; y < getWindowHeight(); ++y) |
| { |
| const int currentPosition = y * getWindowHeight() + x; |
| |
| if (y > x || y >= -x + getWindowHeight() - 1) |
| { |
| EXPECT_EQ(GLColor::red, actualColors[currentPosition]); |
| } |
| else |
| { |
| EXPECT_EQ(GLColor::blue, actualColors[currentPosition]); |
| } |
| } |
| } |
| } |
| |
| // Use this to select which configurations (e.g. which renderer, which GLES major version) these |
| // tests should be run against. |
| ANGLE_INSTANTIATE_TEST_ES2_AND_ES3(ClipDistanceTest); |
| |
| GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(ClipCullDistanceTest); |
| ANGLE_INSTANTIATE_TEST_ES3_AND_ES31(ClipCullDistanceTest); |
