1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <stdlib.h> 18 #include <stdio.h> 19 20 #include <EGL/egl.h> 21 #include <GLES2/gl2.h> 22 23 #include "util.h" 24 25 static const char gVertexShader[] = 26 "attribute vec4 aPosition;\n" 27 "uniform mat4 uTransform;\n" 28 "varying vec4 vTexCoord;\n" 29 "void main() {\n" 30 " gl_Position = aPosition * uTransform;\n" 31 " vTexCoord = aPosition * vec4(1.0/16.0,-1.0/16.0,0.0,0.0);\n" 32 "}\n"; 33 34 static const char gFragmentShader[] = 35 "precision mediump float;\n" 36 "uniform sampler2D uTexture;\n" 37 "uniform float uAnim;\n" 38 "varying vec4 vTexCoord;\n" 39 "void main() {\n" 40 " vec2 tc = vec2(vTexCoord.x, uAnim + vTexCoord.y);\n" 41 " gl_FragColor = texture2D(uTexture, tc);\n" 42 "}\n"; 43 44 static GLuint pgm; 45 static GLint aPosition, uTransform, uTexture, uAnim; 46 47 static GLfloat vtx[2 * 3 * 2]; 48 static GLfloat mtx[16]; 49 50 //#define R (0xFF0000FF) 51 #define R (0xFF000000) 52 #define G (0xFF00FF00) 53 uint32_t t32[] = { 54 R, R, R, R, R, R, R, G, G, R, R, R, R, R, R, R, 55 R, R, R, R, R, R, G, G, G, G, R, R, R, R, R, R, 56 R, R, R, R, R, G, G, G, G, G, G, R, R, R, R, R, 57 R, R, R, R, G, G, G, G, G, G, G, G, R, R, R, R, 58 R, R, R, G, G, G, G, G, G, G, G, G, G, R, R, R, 59 R, R, G, G, G, G, G, G, G, G, G, G, G, G, R, R, 60 R, R, G, G, G, G, G, G, G, G, G, G, G, G, R, R, 61 R, R, R, R, R, R, G, G, G, G, R, R, R, R, R, R, 62 R, R, R, R, R, R, G, G, G, G, R, R, R, R, R, R, 63 R, R, R, R, R, R, G, G, G, G, R, R, R, R, R, R, 64 R, R, R, R, R, R, G, G, G, G, R, R, R, R, R, R, 65 R, R, R, R, R, R, G, G, G, G, R, R, R, R, R, R, 66 R, R, R, R, R, R, G, G, G, G, R, R, R, R, R, R, 67 R, R, R, R, R, R, R, R, R, R, R, R, R, R, R, R, 68 R, R, R, R, R, R, R, R, R, R, R, R, R, R, R, R, 69 R, R, R, R, R, R, R, R, R, R, R, R, R, R, R, R, 70 }; 71 #undef R 72 #undef G 73 74 int prepare(int w, int h) { 75 GLuint texid; 76 77 int left = w / 4; 78 int top = h / 4; 79 int right = (w / 4) * 3; 80 int bottom = (h / 4) * 3; 81 82 vtx[0] = left; 83 vtx[1] = top; 84 vtx[2] = left; 85 vtx[3] = bottom; 86 vtx[4] = right; 87 vtx[5] = bottom; 88 89 vtx[6] = right; 90 vtx[7] = bottom; 91 vtx[8] = right; 92 vtx[9] = top; 93 vtx[10] = left; 94 vtx[11] = top; 95 96 matrix_init_ortho(mtx, w, h); 97 98 pgm = load_program(gVertexShader, gFragmentShader); 99 if (!pgm) 100 return -1; 101 102 aPosition = glGetAttribLocation(pgm, "aPosition"); 103 uTexture = glGetUniformLocation(pgm, "uTexture"); 104 uTransform = glGetUniformLocation(pgm, "uTransform"); 105 uAnim = glGetUniformLocation(pgm, "uAnim"); 106 107 glViewport(0, 0, w, h); 108 109 glGenTextures(1, &texid); 110 glActiveTexture(GL_TEXTURE0); 111 glBindTexture(GL_TEXTURE_2D, texid); 112 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 113 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 114 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); 115 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); 116 glEnable(GL_TEXTURE_2D); 117 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, 118 GL_RGBA, GL_UNSIGNED_BYTE, t32); 119 120 return 0; 121 } 122 123 static float anim = 0.0; 124 125 void render() { 126 anim += 0.1; 127 if (anim >= 16.0) anim = 0.0; 128 129 glClearColor(0.0f, 0.0f, 0.0f, 1.0f); 130 glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); 131 glUseProgram(pgm); 132 glUniform1i(uTexture, 0); 133 glUniform1f(uAnim, anim); 134 glUniformMatrix4fv(uTransform, 1, 0, mtx); 135 glVertexAttribPointer(aPosition, 2, GL_FLOAT, GL_FALSE, 0, vtx); 136 glEnableVertexAttribArray(aPosition); 137 glDrawArrays(GL_TRIANGLES, 0, 6); 138 } 139 140 int main(int argc, char **argv) { 141 EGLDisplay display; 142 EGLSurface surface; 143 int w, h, count; 144 145 if (argc > 1) 146 count = atoi(argv[1]); 147 148 if (egl_create(&display, &surface, &w, &h)) 149 return -1; 150 151 if (prepare(w, h)) 152 return -1; 153 154 for (;;) { 155 render(); 156 eglSwapBuffers(display, surface); 157 if (count > 0) 158 if (--count == 0) 159 break; 160 } 161 162 egl_destroy(display, surface); 163 return 0; 164 } 165
