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test_offscreen_rendering.cpp
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test_offscreen_rendering.cpp
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//#define EGL_EGLEXT_PROTOTYPES
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <assert.h>
#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
#include "fbdev_window.h"
#include "offscreen_window.h"
#include "fdpass.h"
PFNEGLCREATEIMAGEKHRPROC eglCreateImageKHR=0;
PFNEGLDESTROYIMAGEKHRPROC eglDestroyImageKHR=0;
PFNGLEGLIMAGETARGETTEXTURE2DOESPROC glEGLImageTargetTexture2DOES=0;
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"
"varying vec2 yuvTexCoords;\n"
"void main() {\n"
" yuvTexCoords = vPosition.xy + vec2(0.5, 0.5);\n"
" gl_Position = vPosition;\n"
"}\n";
static const char gFragmentShader[] =
"#extension GL_OES_EGL_image_external : require\n"
"precision mediump float;\n"
"uniform samplerExternalOES yuvTexSampler;\n"
"varying vec2 yuvTexCoords;\n"
"void main() {\n"
" gl_FragColor = texture2D(yuvTexSampler, yuvTexCoords);\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);
}
} else {
fprintf(stderr, "Guessing at GL_INFO_LOG_LENGTH size\n");
char* buf = (char*) malloc(0x1000);
if (buf) {
glGetShaderInfoLog(shader, 0x1000, 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;
GLint gvPositionHandle;
GLint gYuvTexSamplerHandle;
const GLfloat gTriangleVertices[] = {
-0.5f, 0.5f,
-0.5f, -0.5f,
0.5f, -0.5f,
0.5f, 0.5f,
};
class EGLClient {
public:
EGLClient() {
EGLConfig ecfg;
EGLint num_config;
EGLint attr[] = { // some attributes to set up our egl-interface
EGL_BUFFER_SIZE, 32,
EGL_RENDERABLE_TYPE,
EGL_OPENGL_ES2_BIT,
EGL_NONE
};
EGLint ctxattr[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
if (display == EGL_NO_DISPLAY) {
printf("ERROR: Could not get default display\n");
return;
}
printf("INFO: Successfully retrieved default display!\n");
eglInitialize(display, 0, 0);
eglChooseConfig((EGLDisplay) display, attr, &ecfg, 1, &num_config);
printf("INFO: Initialized display with default configuration\n");
window = new OffscreenNativeWindow(400, 400);
printf("INFO: Created native window %p\n", window);
printf("creating window surface...\n");
surface = eglCreateWindowSurface((EGLDisplay) display, ecfg, *window, NULL);
assert(surface != EGL_NO_SURFACE);
printf("INFO: Created our main window surface %p\n", surface);
context = eglCreateContext((EGLDisplay) display, ecfg, EGL_NO_CONTEXT, ctxattr);
assert(surface != EGL_NO_CONTEXT);
printf("INFO: Created context for display\n");
frame=0;
};
void render() {
frame = 1;
assert(eglMakeCurrent((EGLDisplay) display, surface, surface, context) == EGL_TRUE);
printf("INFO: Made context and surface current for display\n");
glViewport ( 0 , 0 , 200, 200);
printf("client frame %i\n", frame++);
glClearColor ( 0.20 , 0.50 , 0.50 , 1.);
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
eglSwapBuffers(display, surface);
printf("client swapped\n");
}
int frame;
EGLDisplay display;
EGLContext context;
EGLSurface surface;
OffscreenNativeWindow* window;
};
class EGLCompositor {
public:
EGLCompositor() {
EGLConfig ecfg;
EGLint num_config;
EGLint attr[] = { // some attributes to set up our egl-interface
EGL_BUFFER_SIZE, 32,
EGL_RENDERABLE_TYPE,
EGL_OPENGL_ES2_BIT,
EGL_NONE
};
EGLint ctxattr[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
if (display == EGL_NO_DISPLAY) {
printf("ERROR: Could not get default display\n");
return;
}
printf("INFO: Successfully retrieved default display!\n");
eglInitialize(display, 0, 0);
eglChooseConfig((EGLDisplay) display, attr, &ecfg, 1, &num_config);
printf("INFO: Initialized display with default configuration\n");
window = new FbDevNativeWindow();
printf("INFO: Created native window %p\n", window);
printf("creating window surface...\n");
surface = eglCreateWindowSurface((EGLDisplay) display, ecfg, *window, NULL);
assert(surface != EGL_NO_SURFACE);
printf("INFO: Created our main window surface %p\n", surface);
context = eglCreateContext((EGLDisplay) display, ecfg, EGL_NO_CONTEXT, ctxattr);
assert(surface != EGL_NO_CONTEXT);
printf("INFO: Created context for display\n");
assert(eglMakeCurrent((EGLDisplay) display, surface, surface, context) == EGL_TRUE);
printf("INFO: Made context and surface current for display\n");
frame=0;
gProgram = createProgram(gVertexShader, gFragmentShader);
if (!gProgram) {
printf("no program\n");
abort();
}
gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");
checkGlError("glGetAttribLocation");
fprintf(stderr, "glGetAttribLocation(\"vPosition\") = %d\n",
gvPositionHandle);
gYuvTexSamplerHandle = glGetUniformLocation(gProgram, "yuvTexSampler");
checkGlError("glGetUniformLocation");
fprintf(stderr, "glGetUniformLocation(\"yuvTexSampler\") = %d\n",
gYuvTexSamplerHandle);
glViewport(0, 0, 1024, 768);
checkGlError("glViewport");
};
void render(OffscreenNativeWindowBuffer* buffer) {
assert(eglMakeCurrent((EGLDisplay) display, surface, surface, context) == EGL_TRUE);
printf("INFO: Made context and surface current for display\n");
window->registerBuffer(buffer->getHandle());
EGLClientBuffer cbuf = (EGLClientBuffer) buffer;
EGLint attrs[] = {
EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
EGL_NONE,
};
EGLImageKHR image = eglCreateImageKHR(display, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID, cbuf, attrs);
if (image == EGL_NO_IMAGE_KHR) {
EGLint error = eglGetError();
printf("error creating EGLImage: %#x", error);
}
printf("got egl image %p\n", image);
glGenTextures(1, &texture);
checkGlError("glGenTextures");
glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture);
checkGlError("glBindTexture");
glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, (GLeglImageOES)image);
checkGlError("glEGLImageTargetTexture2DOES");
glViewport ( 0 , 0 , 1024, 768);
printf("compositor frame %i\n", frame++);
float c = (frame % 64) / 64.0f;
glClearColor(0.50f , 0.50f , 0.50f, 1.0 );
checkGlError("glClearColor");
glClear( GL_DEPTH_BUFFER_BIT | 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");
glUniform1i(gYuvTexSamplerHandle, 0);
checkGlError("glUniform1i");
glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture);
checkGlError("glBindTexture");
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
checkGlError("glDrawArrays");
eglSwapBuffers(display, surface);
eglDestroyImageKHR(display, image);
printf("compositor swapped\n");
}
int frame;
EGLDisplay display;
EGLContext context;
EGLSurface surface;
FbDevNativeWindow* window;
GLuint texture;
EGLImageKHR image;
};
int parent(int fd)
{
EGLCompositor compositor;
eglCreateImageKHR = (PFNEGLCREATEIMAGEKHRPROC) eglGetProcAddress("eglCreateImageKHR");
eglDestroyImageKHR = (PFNEGLDESTROYIMAGEKHRPROC) eglGetProcAddress("eglDestroyImageKHR");
glEGLImageTargetTexture2DOES = (PFNGLEGLIMAGETARGETTEXTURE2DOESPROC) eglGetProcAddress("glEGLImageTargetTexture2DOES");
printf ("*** initialized compositor\n");
OffscreenNativeWindowBuffer *client = new OffscreenNativeWindowBuffer(fd);
printf("*** got buffer from client\n");
compositor.render(client);
printf("*** compositor rendered\n");
while (1) {}
}
int child(int fd)
{
EGLClient client;
printf ("**** initialized client\n");
client.render();
OffscreenNativeWindowBuffer *buf = client.window->getFrontBuffer();
buf->writeToFd(fd);
printf("*** client rendered\n");
while (1) {}
}
int main(int argc, char **argv)
{
int sv[2];
int pid;
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv) < 0) {
perror("socketpair");
exit(1);
}
switch ((pid = fork())) {
case 0:
close(sv[0]);
child(sv[1]);
break;
case -1:
perror("fork");
exit(1);
default:
close(sv[1]);
parent(sv[0]);
break;
}
return 0;
}
// vim:ts=4:sw=4:noexpandtab