Lingfeng Yang | e3f818b | 2020-11-03 14:40:44 -0800 | [diff] [blame] | 1 | // Copyright (C) 2018 The Android Open Source Project |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | // This file provides implementation for the sample app HelloTriangle. |
| 16 | // The main executable source is HelloTriangle.cpp. |
| 17 | #include "HelloTriangle.h" |
| 18 | |
| 19 | #include "Standalone.h" |
| 20 | |
| 21 | #include <functional> |
| 22 | |
| 23 | #include <glm/gtc/matrix_transform.hpp> |
| 24 | #include <glm/gtc/type_ptr.hpp> |
| 25 | |
Jason Macnak | ed0c9e6 | 2023-03-30 15:58:24 -0700 | [diff] [blame] | 26 | namespace gfxstream { |
Lingfeng Yang | e3f818b | 2020-11-03 14:40:44 -0800 | [diff] [blame] | 27 | |
| 28 | void HelloTriangle::initialize() { |
| 29 | constexpr char vshaderSrc[] = R"(#version 300 es |
| 30 | precision highp float; |
| 31 | |
| 32 | layout (location = 0) in vec2 pos; |
| 33 | layout (location = 1) in vec3 color; |
| 34 | |
| 35 | uniform mat4 transform; |
| 36 | |
| 37 | out vec3 color_varying; |
| 38 | |
| 39 | void main() { |
| 40 | gl_Position = transform * vec4(pos, 0.0, 1.0); |
| 41 | color_varying = (transform * vec4(color, 1.0)).xyz; |
| 42 | } |
| 43 | )"; |
| 44 | constexpr char fshaderSrc[] = R"(#version 300 es |
| 45 | precision highp float; |
| 46 | |
| 47 | in vec3 color_varying; |
| 48 | |
| 49 | out vec4 fragColor; |
| 50 | |
| 51 | void main() { |
| 52 | fragColor = vec4(color_varying, 1.0); |
| 53 | } |
| 54 | )"; |
| 55 | |
Jason Macnak | ed0c9e6 | 2023-03-30 15:58:24 -0700 | [diff] [blame] | 56 | GLint program = compileAndLinkShaderProgram(vshaderSrc, fshaderSrc); |
Lingfeng Yang | e3f818b | 2020-11-03 14:40:44 -0800 | [diff] [blame] | 57 | |
| 58 | auto gl = getGlDispatch(); |
| 59 | |
| 60 | mTransformLoc = gl->glGetUniformLocation(program, "transform"); |
| 61 | |
| 62 | gl->glEnableVertexAttribArray(0); |
| 63 | gl->glEnableVertexAttribArray(1); |
| 64 | |
| 65 | const VertexAttributes vertexAttrs[] = { |
| 66 | { { -0.5f, -0.5f,}, { 0.2, 0.1, 0.9, }, }, |
| 67 | { { 0.5f, -0.5f,}, { 0.8, 0.3, 0.1,}, }, |
| 68 | { { 0.0f, 0.5f,}, { 0.1, 0.9, 0.6,}, }, |
| 69 | }; |
| 70 | |
| 71 | gl->glGenBuffers(1, &mBuffer); |
| 72 | gl->glBindBuffer(GL_ARRAY_BUFFER, mBuffer); |
| 73 | gl->glBufferData(GL_ARRAY_BUFFER, sizeof(vertexAttrs), vertexAttrs, |
| 74 | GL_STATIC_DRAW); |
| 75 | |
| 76 | gl->glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, |
| 77 | sizeof(VertexAttributes), 0); |
| 78 | gl->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, |
| 79 | sizeof(VertexAttributes), |
| 80 | (GLvoid*)offsetof(VertexAttributes, color)); |
| 81 | |
| 82 | gl->glUseProgram(program); |
| 83 | |
| 84 | gl->glClearColor(0.2f, 0.2f, 0.3f, 0.0f); |
| 85 | } |
| 86 | |
| 87 | void HelloTriangle::draw() { |
| 88 | glm::mat4 rot = |
| 89 | glm::rotate(glm::mat4(), mTime, glm::vec3(0.0f, 0.0f, 1.0f)); |
| 90 | |
| 91 | auto gl = getGlDispatch(); |
| 92 | |
| 93 | gl->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 94 | gl->glUniformMatrix4fv(mTransformLoc, 1, GL_FALSE, glm::value_ptr(rot)); |
| 95 | gl->glDrawArrays(GL_TRIANGLES, 0, 3); |
| 96 | |
| 97 | mTime += 0.05f; |
| 98 | } |
| 99 | |
Jason Macnak | ed0c9e6 | 2023-03-30 15:58:24 -0700 | [diff] [blame] | 100 | } // namespace gfxstream |