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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <sched.h>
#include <sys/resource.h>
#include <EGL/egl.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <utils/Timers.h>
#include <WindowSurface.h>
#include <EGLUtils.h>
using namespace android;
static void printGLString(const char *name, GLenum s) {
// fprintf(stderr, "printGLString %s, %d\n", name, s);
const char *v = (const char *) glGetString(s);
// int error = glGetError();
// fprintf(stderr, "glGetError() = %d, result of glGetString = %x\n", error,
// (unsigned int) v);
// if ((v < (const char*) 0) || (v > (const char*) 0x10000))
// fprintf(stderr, "GL %s = %s\n", name, v);
// else
// fprintf(stderr, "GL %s = (null) 0x%08x\n", name, (unsigned int) v);
fprintf(stderr, "GL %s = %s\n", name, v);
}
static void checkEglError(const char* op, EGLBoolean returnVal = EGL_TRUE) {
if (returnVal != EGL_TRUE) {
fprintf(stderr, "%s() returned %d\n", op, returnVal);
}
for (EGLint error = eglGetError(); error != EGL_SUCCESS; error
= eglGetError()) {
fprintf(stderr, "after %s() eglError %s (0x%x)\n", op, EGLUtils::strerror(error),
error);
}
}
static void checkGlError(const char* op) {
for (GLint error = glGetError(); error; error
= glGetError()) {
fprintf(stderr, "after %s() glError (0x%x)\n", op, error);
}
}
static const char gVertexShader[] = "attribute vec4 vPosition;\n"
"void main() {\n"
" gl_Position = vPosition;\n"
"}\n";
static const char gFragmentShader[] = "precision mediump float;\n"
"void main() {\n"
" gl_FragColor = vec4(0.0, 1.0, 0.0, 0.5);\n"
"}\n";
GLuint loadShader(GLenum shaderType, const char* pSource) {
GLuint shader = glCreateShader(shaderType);
if (shader) {
glShaderSource(shader, 1, &pSource, NULL);
glCompileShader(shader);
GLint compiled = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
GLint infoLen = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
if (infoLen) {
char* buf = (char*) malloc(infoLen);
if (buf) {
glGetShaderInfoLog(shader, infoLen, NULL, buf);
fprintf(stderr, "Could not compile shader %d:\n%s\n",
shaderType, buf);
free(buf);
}
glDeleteShader(shader);
shader = 0;
}
}
}
return shader;
}
GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) {
GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
if (!vertexShader) {
return 0;
}
GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
if (!pixelShader) {
return 0;
}
GLuint program = glCreateProgram();
if (program) {
glAttachShader(program, vertexShader);
checkGlError("glAttachShader");
glAttachShader(program, pixelShader);
checkGlError("glAttachShader");
glLinkProgram(program);
GLint linkStatus = GL_FALSE;
glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
if (linkStatus != GL_TRUE) {
GLint bufLength = 0;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
if (bufLength) {
char* buf = (char*) malloc(bufLength);
if (buf) {
glGetProgramInfoLog(program, bufLength, NULL, buf);
fprintf(stderr, "Could not link program:\n%s\n", buf);
free(buf);
}
}
glDeleteProgram(program);
program = 0;
}
}
return program;
}
GLuint gProgram;
GLuint gTextureProgram;
GLuint gvPositionHandle;
GLuint gvTexturePositionHandle;
GLuint gvTextureTexCoordsHandle;
GLuint gvTextureSamplerHandle;
GLuint gFbo;
GLuint gTexture;
GLuint gBufferTexture;
static const char gSimpleVS[] =
"attribute vec4 position;\n"
"attribute vec2 texCoords;\n"
"varying vec2 outTexCoords;\n"
"\nvoid main(void) {\n"
" outTexCoords = texCoords;\n"
" gl_Position = position;\n"
"}\n\n";
static const char gSimpleFS[] =
"precision mediump float;\n\n"
"varying vec2 outTexCoords;\n"
"uniform sampler2D texture;\n"
"\nvoid main(void) {\n"
" gl_FragColor = texture2D(texture, outTexCoords);\n"
"}\n\n";
bool setupGraphics(int w, int h) {
gProgram = createProgram(gVertexShader, gFragmentShader);
if (!gProgram) {
return false;
}
gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");
checkGlError("glGetAttribLocation");
fprintf(stderr, "glGetAttribLocation(\"vPosition\") = %d\n", gvPositionHandle);
gTextureProgram = createProgram(gSimpleVS, gSimpleFS);
if (!gTextureProgram) {
return false;
}
gvTexturePositionHandle = glGetAttribLocation(gTextureProgram, "position");
checkGlError("glGetAttribLocation");
gvTextureTexCoordsHandle = glGetAttribLocation(gTextureProgram, "texCoords");
checkGlError("glGetAttribLocation");
gvTextureSamplerHandle = glGetUniformLocation(gTextureProgram, "texture");
checkGlError("glGetAttribLocation");
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &gTexture);
glBindTexture(GL_TEXTURE_2D, gTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glGenTextures(1, &gBufferTexture);
glBindTexture(GL_TEXTURE_2D, gBufferTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glGenFramebuffers(1, &gFbo);
glBindFramebuffer(GL_FRAMEBUFFER, gFbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, gTexture, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glViewport(0, 0, w, h);
checkGlError("glViewport");
return true;
}
const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f,
0.5f, -0.5f };
const GLint FLOAT_SIZE_BYTES = 4;
const GLint TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
const GLfloat gTriangleVerticesData[] = {
// X, Y, Z, U, V
-1.0f, -1.0f, 0, 0.f, 0.f,
1.0f, -1.0f, 0, 1.f, 0.f,
-1.0f, 1.0f, 0, 0.f, 1.f,
1.0f, 1.0f, 0, 1.f, 1.f,
};
void renderFrame(GLint w, GLint h) {
glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
checkGlError("glClearColor");
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
checkGlError("glClear");
// Bind FBO and draw into it
glBindFramebuffer(GL_FRAMEBUFFER, gFbo);
checkGlError("glBindFramebuffer");
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
checkGlError("glClearColor");
glClear(GL_COLOR_BUFFER_BIT);
checkGlError("glClear");
glUseProgram(gProgram);
checkGlError("glUseProgram");
glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);
checkGlError("glVertexAttribPointer");
glEnableVertexAttribArray(gvPositionHandle);
checkGlError("glEnableVertexAttribArray");
glDrawArrays(GL_TRIANGLES, 0, 3);
checkGlError("glDrawArrays");
// Copy content of FBO into a texture
glBindTexture(GL_TEXTURE_2D, gBufferTexture);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, w / 2, h / 2);
checkGlError("glCopyTexSubImage2D");
// Back to the display
glBindFramebuffer(GL_FRAMEBUFFER, 0);
checkGlError("glBindFramebuffer");
// Draw copied content on the screen
glUseProgram(gTextureProgram);
checkGlError("glUseProgram");
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glVertexAttribPointer(gvTexturePositionHandle, 3, GL_FLOAT, GL_FALSE,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, gTriangleVerticesData);
checkGlError("glVertexAttribPointer");
glVertexAttribPointer(gvTextureTexCoordsHandle, 2, GL_FLOAT, GL_FALSE,
TRIANGLE_VERTICES_DATA_STRIDE_BYTES, &gTriangleVerticesData[3]);
checkGlError("glVertexAttribPointer");
glEnableVertexAttribArray(gvTexturePositionHandle);
glEnableVertexAttribArray(gvTextureTexCoordsHandle);
checkGlError("glEnableVertexAttribArray");
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
checkGlError("glDrawArrays");
}
void printEGLConfiguration(EGLDisplay dpy, EGLConfig config) {
#define X(VAL) {VAL, #VAL}
struct {EGLint attribute; const char* name;} names[] = {
X(EGL_BUFFER_SIZE),
X(EGL_ALPHA_SIZE),
X(EGL_BLUE_SIZE),
X(EGL_GREEN_SIZE),
X(EGL_RED_SIZE),
X(EGL_DEPTH_SIZE),
X(EGL_STENCIL_SIZE),
X(EGL_CONFIG_CAVEAT),
X(EGL_CONFIG_ID),
X(EGL_LEVEL),
X(EGL_MAX_PBUFFER_HEIGHT),
X(EGL_MAX_PBUFFER_PIXELS),
X(EGL_MAX_PBUFFER_WIDTH),
X(EGL_NATIVE_RENDERABLE),
X(EGL_NATIVE_VISUAL_ID),
X(EGL_NATIVE_VISUAL_TYPE),
X(EGL_SAMPLES),
X(EGL_SAMPLE_BUFFERS),
X(EGL_SURFACE_TYPE),
X(EGL_TRANSPARENT_TYPE),
X(EGL_TRANSPARENT_RED_VALUE),
X(EGL_TRANSPARENT_GREEN_VALUE),
X(EGL_TRANSPARENT_BLUE_VALUE),
X(EGL_BIND_TO_TEXTURE_RGB),
X(EGL_BIND_TO_TEXTURE_RGBA),
X(EGL_MIN_SWAP_INTERVAL),
X(EGL_MAX_SWAP_INTERVAL),
X(EGL_LUMINANCE_SIZE),
X(EGL_ALPHA_MASK_SIZE),
X(EGL_COLOR_BUFFER_TYPE),
X(EGL_RENDERABLE_TYPE),
X(EGL_CONFORMANT),
};
#undef X
for (size_t j = 0; j < sizeof(names) / sizeof(names[0]); j++) {
EGLint value = -1;
EGLint returnVal = eglGetConfigAttrib(dpy, config, names[j].attribute, &value);
EGLint error = eglGetError();
if (returnVal && error == EGL_SUCCESS) {
printf(" %s: ", names[j].name);
printf("%d (0x%x)", value, value);
}
}
printf("\n");
}
int printEGLConfigurations(EGLDisplay dpy) {
EGLint numConfig = 0;
EGLint returnVal = eglGetConfigs(dpy, NULL, 0, &numConfig);
checkEglError("eglGetConfigs", returnVal);
if (!returnVal) {
return false;
}
printf("Number of EGL configuration: %d\n", numConfig);
EGLConfig* configs = (EGLConfig*) malloc(sizeof(EGLConfig) * numConfig);
if (! configs) {
printf("Could not allocate configs.\n");
return false;
}
returnVal = eglGetConfigs(dpy, configs, numConfig, &numConfig);
checkEglError("eglGetConfigs", returnVal);
if (!returnVal) {
free(configs);
return false;
}
for(int i = 0; i < numConfig; i++) {
printf("Configuration %d\n", i);
printEGLConfiguration(dpy, configs[i]);
}
free(configs);
return true;
}
int main(int /*argc*/, char** /*argv*/) {
EGLBoolean returnValue;
EGLConfig myConfig = {0};
EGLint context_attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
EGLint s_configAttribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_NONE };
EGLint majorVersion;
EGLint minorVersion;
EGLContext context;
EGLSurface surface;
EGLint w, h;
EGLDisplay dpy;
checkEglError("<init>");
dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
checkEglError("eglGetDisplay");
if (dpy == EGL_NO_DISPLAY) {
printf("eglGetDisplay returned EGL_NO_DISPLAY.\n");
return 0;
}
returnValue = eglInitialize(dpy, &majorVersion, &minorVersion);
checkEglError("eglInitialize", returnValue);
fprintf(stderr, "EGL version %d.%d\n", majorVersion, minorVersion);
if (returnValue != EGL_TRUE) {
printf("eglInitialize failed\n");
return 0;
}
if (!printEGLConfigurations(dpy)) {
printf("printEGLConfigurations failed\n");
return 0;
}
checkEglError("printEGLConfigurations");
WindowSurface windowSurface;
EGLNativeWindowType window = windowSurface.getSurface();
EGLint numConfigs = -1, n = 0;
eglChooseConfig(dpy, s_configAttribs, 0, 0, &numConfigs);
if (numConfigs) {
EGLConfig* const configs = new EGLConfig[numConfigs];
eglChooseConfig(dpy, s_configAttribs, configs, numConfigs, &n);
myConfig = configs[0];
delete[] configs;
}
checkEglError("EGLUtils::selectConfigForNativeWindow");
printf("Chose this configuration:\n");
printEGLConfiguration(dpy, myConfig);
surface = eglCreateWindowSurface(dpy, myConfig, window, NULL);
checkEglError("eglCreateWindowSurface");
if (surface == EGL_NO_SURFACE) {
printf("gelCreateWindowSurface failed.\n");
return 0;
}
context = eglCreateContext(dpy, myConfig, EGL_NO_CONTEXT, context_attribs);
checkEglError("eglCreateContext");
if (context == EGL_NO_CONTEXT) {
printf("eglCreateContext failed\n");
return 0;
}
returnValue = eglMakeCurrent(dpy, surface, surface, context);
checkEglError("eglMakeCurrent", returnValue);
if (returnValue != EGL_TRUE) {
return 0;
}
eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
checkEglError("eglQuerySurface");
eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
checkEglError("eglQuerySurface");
fprintf(stderr, "Window dimensions: %d x %d\n", w, h);
printGLString("Version", GL_VERSION);
printGLString("Vendor", GL_VENDOR);
printGLString("Renderer", GL_RENDERER);
printGLString("Extensions", GL_EXTENSIONS);
if(!setupGraphics(w, h)) {
fprintf(stderr, "Could not set up graphics.\n");
return 0;
}
for (;;) {
renderFrame(w, h);
eglSwapBuffers(dpy, surface);
checkEglError("eglSwapBuffers");
}
return 0;
}