Geoff Lang | e977efc | 2014-03-04 11:43:04 -0500 | [diff] [blame] | 1 | // |
| 2 | // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved. |
| 3 | // Use of this source code is governed by a BSD-style license that can be |
| 4 | // found in the LICENSE file. |
| 5 | // |
| 6 | |
| 7 | // Based on Simple_VertexShader.c from |
| 8 | // Book: OpenGL(R) ES 2.0 Programming Guide |
| 9 | // Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner |
| 10 | // ISBN-10: 0321502795 |
| 11 | // ISBN-13: 9780321502797 |
| 12 | // Publisher: Addison-Wesley Professional |
| 13 | // URLs: http://safari.informit.com/9780321563835 |
| 14 | // http://www.opengles-book.com |
| 15 | |
| 16 | #include "SampleApplication.h" |
| 17 | #include "shader_utils.h" |
| 18 | #include "texture_utils.h" |
| 19 | #include "geometry_utils.h" |
| 20 | #include "Vector.h" |
| 21 | #include "Matrix.h" |
| 22 | #include <iostream> |
| 23 | |
| 24 | class PostSubBufferSample : public SampleApplication |
| 25 | { |
| 26 | public: |
| 27 | PostSubBufferSample::PostSubBufferSample() |
| 28 | : SampleApplication("PostSubBuffer", 1280, 720) |
| 29 | { |
| 30 | } |
| 31 | |
| 32 | virtual bool initialize() |
| 33 | { |
| 34 | mPostSubBufferNV = (PFNEGLPOSTSUBBUFFERNVPROC)eglGetProcAddress("eglPostSubBufferNV"); |
| 35 | if (!mPostSubBufferNV) |
| 36 | { |
| 37 | std::cerr << "Could not load eglPostSubBufferNV."; |
| 38 | return false; |
| 39 | } |
| 40 | |
| 41 | const std::string vs = SHADER_SOURCE |
| 42 | ( |
| 43 | uniform mat4 u_mvpMatrix; |
| 44 | attribute vec4 a_position; |
| 45 | attribute vec2 a_texcoord; |
| 46 | varying vec2 v_texcoord; |
| 47 | void main() |
| 48 | { |
| 49 | gl_Position = u_mvpMatrix * a_position; |
| 50 | v_texcoord = a_texcoord; |
| 51 | } |
| 52 | ); |
| 53 | |
| 54 | const std::string fs = SHADER_SOURCE |
| 55 | ( |
| 56 | precision mediump float; |
| 57 | varying vec2 v_texcoord; |
| 58 | void main() |
| 59 | { |
| 60 | gl_FragColor = vec4(v_texcoord.x, v_texcoord.y, 1.0, 1.0); |
| 61 | } |
| 62 | ); |
| 63 | |
| 64 | mProgram = CompileProgram(vs, fs); |
| 65 | if (!mProgram) |
| 66 | { |
| 67 | return false; |
| 68 | } |
| 69 | |
| 70 | // Get the attribute locations |
| 71 | mPositionLoc = glGetAttribLocation(mProgram, "a_position"); |
| 72 | mTexcoordLoc = glGetAttribLocation(mProgram, "a_texcoord"); |
| 73 | |
| 74 | // Get the uniform locations |
| 75 | mMVPMatrixLoc = glGetUniformLocation(mProgram, "u_mvpMatrix"); |
| 76 | |
| 77 | // Generate the geometry data |
| 78 | GenerateCubeGeometry(0.5f, &mCube); |
| 79 | |
| 80 | // Set an initial rotation |
| 81 | mRotation = 45.0f; |
| 82 | |
| 83 | // Clear the whole window surface to blue. |
| 84 | glClearColor(0.0f, 0.0f, 1.0f, 0.0f); |
| 85 | glClear(GL_COLOR_BUFFER_BIT); |
| 86 | SampleApplication::swap(); |
| 87 | |
| 88 | glClearColor(0.0f, 0.0f, 0.0f, 0.0f); |
| 89 | glCullFace(GL_BACK); |
| 90 | glEnable(GL_CULL_FACE); |
| 91 | |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | virtual void destroy() |
| 96 | { |
| 97 | glDeleteProgram(mProgram); |
| 98 | } |
| 99 | |
| 100 | virtual void step(float dt, double totalTime) |
| 101 | { |
| 102 | mRotation = fmod(mRotation + (dt * 40.0f), 360.0f); |
| 103 | |
| 104 | Matrix4 perspectiveMatrix = Matrix4::perspective(60.0f, float(getWindow()->getWidth()) / getWindow()->getHeight(), |
| 105 | 1.0f, 20.0f); |
| 106 | |
| 107 | Matrix4 modelMatrix = Matrix4::translate(Vector3(0.0f, 0.0f, -2.0f)) * |
| 108 | Matrix4::rotate(mRotation, Vector3(1.0f, 0.0f, 1.0f)); |
| 109 | |
| 110 | Matrix4 viewMatrix = Matrix4::identity(); |
| 111 | |
| 112 | Matrix4 mvpMatrix = perspectiveMatrix * viewMatrix * modelMatrix; |
| 113 | |
| 114 | // Load the matrices |
| 115 | glUniformMatrix4fv(mMVPMatrixLoc, 1, GL_FALSE, mvpMatrix.data); |
| 116 | } |
| 117 | |
| 118 | virtual void draw() |
| 119 | { |
| 120 | // Set the viewport |
| 121 | glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight()); |
| 122 | |
| 123 | // Clear the color buffer |
| 124 | glClear(GL_COLOR_BUFFER_BIT); |
| 125 | |
| 126 | // Use the program object |
| 127 | glUseProgram(mProgram); |
| 128 | |
| 129 | // Load the vertex position |
| 130 | glVertexAttribPointer(mPositionLoc, 3, GL_FLOAT, GL_FALSE, 0, mCube.positions.data()); |
| 131 | glEnableVertexAttribArray(mPositionLoc); |
| 132 | |
| 133 | // Load the texcoord data |
| 134 | glVertexAttribPointer(mTexcoordLoc, 2, GL_FLOAT, GL_FALSE, 0, mCube.texcoords.data()); |
| 135 | glEnableVertexAttribArray(mTexcoordLoc); |
| 136 | |
| 137 | // Draw the cube |
| 138 | glDrawElements(GL_TRIANGLES, mCube.indices.size(), GL_UNSIGNED_SHORT, mCube.indices.data()); |
| 139 | } |
| 140 | |
| 141 | virtual void swap() |
| 142 | { |
| 143 | // Instead of letting the application call eglSwapBuffers, call eglPostSubBufferNV here instead |
| 144 | size_t windowWidth = getWindow()->getWidth(); |
| 145 | size_t windowHeight = getWindow()->getHeight(); |
| 146 | EGLDisplay display = getWindow()->getDisplay(); |
| 147 | EGLSurface surface = getSurface(); |
| 148 | mPostSubBufferNV(display, surface, 60, 60, windowWidth - 120, windowHeight - 120); |
| 149 | } |
| 150 | |
| 151 | private: |
| 152 | // Handle to a program object |
| 153 | GLuint mProgram; |
| 154 | |
| 155 | // Attribute locations |
| 156 | GLint mPositionLoc; |
| 157 | GLint mTexcoordLoc; |
| 158 | |
| 159 | // Uniform locations |
| 160 | GLuint mMVPMatrixLoc; |
| 161 | |
| 162 | // Current rotation |
| 163 | float mRotation; |
| 164 | |
| 165 | // Geometry data |
| 166 | CubeGeometry mCube; |
| 167 | |
| 168 | // eglPostSubBufferNV entry point |
| 169 | PFNEGLPOSTSUBBUFFERNVPROC mPostSubBufferNV; |
| 170 | }; |
| 171 | |
| 172 | int main(int argc, char **argv) |
| 173 | { |
| 174 | PostSubBufferSample app; |
| 175 | return app.run(); |
| 176 | } |