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      1 /*
      2  * Copyright (C) 2007 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 #include <time.h>
     20 #include <sched.h>
     21 #include <sys/resource.h>
     22 
     23 #include <EGL/egl.h>
     24 #include <GLES2/gl2.h>
     25 #include <GLES2/gl2ext.h>
     26 
     27 #include <utils/Timers.h>
     28 
     29 #include <ui/FramebufferNativeWindow.h>
     30 #include <ui/EGLUtils.h>
     31 
     32 using namespace android;
     33 
     34 static void printGLString(const char *name, GLenum s) {
     35     // fprintf(stderr, "printGLString %s, %d\n", name, s);
     36     const char *v = (const char *) glGetString(s);
     37     // int error = glGetError();
     38     // fprintf(stderr, "glGetError() = %d, result of glGetString = %x\n", error,
     39     //        (unsigned int) v);
     40     // if ((v < (const char*) 0) || (v > (const char*) 0x10000))
     41     //    fprintf(stderr, "GL %s = %s\n", name, v);
     42     // else
     43     //    fprintf(stderr, "GL %s = (null) 0x%08x\n", name, (unsigned int) v);
     44     fprintf(stderr, "GL %s = %s\n", name, v);
     45 }
     46 
     47 static void checkEglError(const char* op, EGLBoolean returnVal = EGL_TRUE) {
     48     if (returnVal != EGL_TRUE) {
     49         fprintf(stderr, "%s() returned %d\n", op, returnVal);
     50     }
     51 
     52     for (EGLint error = eglGetError(); error != EGL_SUCCESS; error
     53             = eglGetError()) {
     54         fprintf(stderr, "after %s() eglError %s (0x%x)\n", op, EGLUtils::strerror(error),
     55                 error);
     56     }
     57 }
     58 
     59 static void checkGlError(const char* op) {
     60     for (GLint error = glGetError(); error; error
     61             = glGetError()) {
     62         fprintf(stderr, "after %s() glError (0x%x)\n", op, error);
     63     }
     64 }
     65 
     66 static const char gVertexShader[] = "attribute vec4 vPosition;\n"
     67     "void main() {\n"
     68     "  gl_Position = vPosition;\n"
     69     "}\n";
     70 
     71 static const char gFragmentShader[] = "precision mediump float;\n"
     72     "void main() {\n"
     73     "  gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
     74     "}\n";
     75 
     76 GLuint loadShader(GLenum shaderType, const char* pSource) {
     77     GLuint shader = glCreateShader(shaderType);
     78     if (shader) {
     79         glShaderSource(shader, 1, &pSource, NULL);
     80         glCompileShader(shader);
     81         GLint compiled = 0;
     82         glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
     83         if (!compiled) {
     84             GLint infoLen = 0;
     85             glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
     86             if (infoLen) {
     87                 char* buf = (char*) malloc(infoLen);
     88                 if (buf) {
     89                     glGetShaderInfoLog(shader, infoLen, NULL, buf);
     90                     fprintf(stderr, "Could not compile shader %d:\n%s\n",
     91                             shaderType, buf);
     92                     free(buf);
     93                 }
     94                 glDeleteShader(shader);
     95                 shader = 0;
     96             }
     97         }
     98     }
     99     return shader;
    100 }
    101 
    102 GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) {
    103     GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
    104     if (!vertexShader) {
    105         return 0;
    106     }
    107 
    108     GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
    109     if (!pixelShader) {
    110         return 0;
    111     }
    112 
    113     GLuint program = glCreateProgram();
    114     if (program) {
    115         glAttachShader(program, vertexShader);
    116         checkGlError("glAttachShader");
    117         glAttachShader(program, pixelShader);
    118         checkGlError("glAttachShader");
    119         glLinkProgram(program);
    120         GLint linkStatus = GL_FALSE;
    121         glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
    122         if (linkStatus != GL_TRUE) {
    123             GLint bufLength = 0;
    124             glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
    125             if (bufLength) {
    126                 char* buf = (char*) malloc(bufLength);
    127                 if (buf) {
    128                     glGetProgramInfoLog(program, bufLength, NULL, buf);
    129                     fprintf(stderr, "Could not link program:\n%s\n", buf);
    130                     free(buf);
    131                 }
    132             }
    133             glDeleteProgram(program);
    134             program = 0;
    135         }
    136     }
    137     return program;
    138 }
    139 
    140 GLuint gProgram;
    141 GLuint gvPositionHandle;
    142 
    143 bool setupGraphics(int w, int h) {
    144     gProgram = createProgram(gVertexShader, gFragmentShader);
    145     if (!gProgram) {
    146         return false;
    147     }
    148     gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");
    149     checkGlError("glGetAttribLocation");
    150     fprintf(stderr, "glGetAttribLocation(\"vPosition\") = %d\n",
    151             gvPositionHandle);
    152 
    153     glViewport(0, 0, w, h);
    154     checkGlError("glViewport");
    155     return true;
    156 }
    157 
    158 const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f,
    159         0.5f, -0.5f };
    160 
    161 void renderFrame() {
    162     glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
    163     checkGlError("glClearColor");
    164     glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
    165     checkGlError("glClear");
    166 
    167     glUseProgram(gProgram);
    168     checkGlError("glUseProgram");
    169 
    170     glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);
    171     checkGlError("glVertexAttribPointer");
    172     glEnableVertexAttribArray(gvPositionHandle);
    173     checkGlError("glEnableVertexAttribArray");
    174     glDrawArrays(GL_TRIANGLES, 0, 3);
    175     checkGlError("glDrawArrays");
    176 }
    177 
    178 void printEGLConfiguration(EGLDisplay dpy, EGLConfig config) {
    179 
    180 #define X(VAL) {VAL, #VAL}
    181     struct {EGLint attribute; const char* name;} names[] = {
    182     X(EGL_BUFFER_SIZE),
    183     X(EGL_ALPHA_SIZE),
    184     X(EGL_BLUE_SIZE),
    185     X(EGL_GREEN_SIZE),
    186     X(EGL_RED_SIZE),
    187     X(EGL_DEPTH_SIZE),
    188     X(EGL_STENCIL_SIZE),
    189     X(EGL_CONFIG_CAVEAT),
    190     X(EGL_CONFIG_ID),
    191     X(EGL_LEVEL),
    192     X(EGL_MAX_PBUFFER_HEIGHT),
    193     X(EGL_MAX_PBUFFER_PIXELS),
    194     X(EGL_MAX_PBUFFER_WIDTH),
    195     X(EGL_NATIVE_RENDERABLE),
    196     X(EGL_NATIVE_VISUAL_ID),
    197     X(EGL_NATIVE_VISUAL_TYPE),
    198     X(EGL_PRESERVED_RESOURCES),
    199     X(EGL_SAMPLES),
    200     X(EGL_SAMPLE_BUFFERS),
    201     X(EGL_SURFACE_TYPE),
    202     X(EGL_TRANSPARENT_TYPE),
    203     X(EGL_TRANSPARENT_RED_VALUE),
    204     X(EGL_TRANSPARENT_GREEN_VALUE),
    205     X(EGL_TRANSPARENT_BLUE_VALUE),
    206     X(EGL_BIND_TO_TEXTURE_RGB),
    207     X(EGL_BIND_TO_TEXTURE_RGBA),
    208     X(EGL_MIN_SWAP_INTERVAL),
    209     X(EGL_MAX_SWAP_INTERVAL),
    210     X(EGL_LUMINANCE_SIZE),
    211     X(EGL_ALPHA_MASK_SIZE),
    212     X(EGL_COLOR_BUFFER_TYPE),
    213     X(EGL_RENDERABLE_TYPE),
    214     X(EGL_CONFORMANT),
    215    };
    216 #undef X
    217 
    218     for (size_t j = 0; j < sizeof(names) / sizeof(names[0]); j++) {
    219         EGLint value = -1;
    220         EGLint returnVal = eglGetConfigAttrib(dpy, config, names[j].attribute, &value);
    221         EGLint error = eglGetError();
    222         if (returnVal && error == EGL_SUCCESS) {
    223             printf(" %s: ", names[j].name);
    224             printf("%d (0x%x)", value, value);
    225         }
    226     }
    227     printf("\n");
    228 }
    229 
    230 int printEGLConfigurations(EGLDisplay dpy) {
    231     EGLint numConfig = 0;
    232     EGLint returnVal = eglGetConfigs(dpy, NULL, 0, &numConfig);
    233     checkEglError("eglGetConfigs", returnVal);
    234     if (!returnVal) {
    235         return false;
    236     }
    237 
    238     printf("Number of EGL configuration: %d\n", numConfig);
    239 
    240     EGLConfig* configs = (EGLConfig*) malloc(sizeof(EGLConfig) * numConfig);
    241     if (! configs) {
    242         printf("Could not allocate configs.\n");
    243         return false;
    244     }
    245 
    246     returnVal = eglGetConfigs(dpy, configs, numConfig, &numConfig);
    247     checkEglError("eglGetConfigs", returnVal);
    248     if (!returnVal) {
    249         free(configs);
    250         return false;
    251     }
    252 
    253     for(int i = 0; i < numConfig; i++) {
    254         printf("Configuration %d\n", i);
    255         printEGLConfiguration(dpy, configs[i]);
    256     }
    257 
    258     free(configs);
    259     return true;
    260 }
    261 
    262 int main(int argc, char** argv) {
    263     EGLBoolean returnValue;
    264     EGLConfig myConfig = {0};
    265 
    266     EGLint context_attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
    267     EGLint s_configAttribs[] = {
    268             EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
    269             EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
    270             EGL_NONE };
    271     EGLint majorVersion;
    272     EGLint minorVersion;
    273     EGLContext context;
    274     EGLSurface surface;
    275     EGLint w, h;
    276 
    277     EGLDisplay dpy;
    278 
    279     checkEglError("<init>");
    280     dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    281     checkEglError("eglGetDisplay");
    282     if (dpy == EGL_NO_DISPLAY) {
    283         printf("eglGetDisplay returned EGL_NO_DISPLAY.\n");
    284         return 0;
    285     }
    286 
    287     returnValue = eglInitialize(dpy, &majorVersion, &minorVersion);
    288     checkEglError("eglInitialize", returnValue);
    289     fprintf(stderr, "EGL version %d.%d\n", majorVersion, minorVersion);
    290     if (returnValue != EGL_TRUE) {
    291         printf("eglInitialize failed\n");
    292         return 0;
    293     }
    294 
    295     if (!printEGLConfigurations(dpy)) {
    296         printf("printEGLConfigurations failed\n");
    297         return 0;
    298     }
    299 
    300     checkEglError("printEGLConfigurations");
    301 
    302     EGLNativeWindowType window = android_createDisplaySurface();
    303     returnValue = EGLUtils::selectConfigForNativeWindow(dpy, s_configAttribs, window, &myConfig);
    304     if (returnValue) {
    305         printf("EGLUtils::selectConfigForNativeWindow() returned %d", returnValue);
    306         return 0;
    307     }
    308 
    309     checkEglError("EGLUtils::selectConfigForNativeWindow");
    310 
    311     printf("Chose this configuration:\n");
    312     printEGLConfiguration(dpy, myConfig);
    313 
    314     surface = eglCreateWindowSurface(dpy, myConfig, window, NULL);
    315     checkEglError("eglCreateWindowSurface");
    316     if (surface == EGL_NO_SURFACE) {
    317         printf("gelCreateWindowSurface failed.\n");
    318         return 0;
    319     }
    320 
    321     context = eglCreateContext(dpy, myConfig, EGL_NO_CONTEXT, context_attribs);
    322     checkEglError("eglCreateContext");
    323     if (context == EGL_NO_CONTEXT) {
    324         printf("eglCreateContext failed\n");
    325         return 0;
    326     }
    327     returnValue = eglMakeCurrent(dpy, surface, surface, context);
    328     checkEglError("eglMakeCurrent", returnValue);
    329     if (returnValue != EGL_TRUE) {
    330         return 0;
    331     }
    332     eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
    333     checkEglError("eglQuerySurface");
    334     eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
    335     checkEglError("eglQuerySurface");
    336     GLint dim = w < h ? w : h;
    337 
    338     fprintf(stderr, "Window dimensions: %d x %d\n", w, h);
    339 
    340     printGLString("Version", GL_VERSION);
    341     printGLString("Vendor", GL_VENDOR);
    342     printGLString("Renderer", GL_RENDERER);
    343     printGLString("Extensions", GL_EXTENSIONS);
    344 
    345     if(!setupGraphics(w, h)) {
    346         fprintf(stderr, "Could not set up graphics.\n");
    347         return 0;
    348     }
    349 
    350     for (;;) {
    351         renderFrame();
    352         eglSwapBuffers(dpy, surface);
    353         checkEglError("eglSwapBuffers");
    354     }
    355 
    356     return 0;
    357 }
    358