PBuffer render-to-texture problem...

genpfaultgmail-com · March 26, 2009, 7:32pm

Using the win32 headers/binaries in OGLES-1.1_WINDOWS_PCEMULATION_2.04.24.0811.msi, on a Radeon X1300:

I’m trying to figure out render-to-texture using pbuffers and ran into a problem.

With the code below pbw = pbh = 128 results in expected behavior:

Anything larger than the main window (pbw = pbh = 256 and up for a 320x240 window) seems to clip/clamp the texture to the main window dimensions:

Is there a problem with the code or is the SDK doing something odd? Or can pbuffers only be smaller than your main window/surface?

#include <iostream>

#include <SDL/SDL.h>

#include <SDL/SDL_syswm.h>

#include <GLES/egl.h>

#include <GLES/gl.h>

using namespace std;

int main(int argc, char* argv[])

{

SDL_Init(SDL_INIT_EVERYTHING);

const int winw = 320;

const int winh = 240;

SDL_SetVideoMode(winw, winh, 32, 0);

// grab the window’s HWND

static SDL_SysWMinfo wmInfo;

SDL_VERSION( &wmInfo.version );

SDL_GetWMInfo( &wmInfo );

NativeDisplayType nativeDisplay = (NativeDisplayType)GetDC(wmInfo.window);

NativeWindowType nativeWindow = (NativeWindowType)wmInfo.window;

const int pbw = 512;

const int pbh = 512;

EGLDisplay eglDisplay;

EGLConfig eglConfig;

EGLSurface eglSurface;

EGLContext eglContext;

eglDisplay = eglGetDisplay( nativeDisplay );

eglInitialize(eglDisplay, NULL, NULL);

EGLint attribs[] = {

 EGL_RED_SIZE, 5,

 EGL_GREEN_SIZE, 5,

 EGL_BLUE_SIZE, 5,

 EGL_ALPHA_SIZE, 0,

 EGL_DEPTH_SIZE, 16,

 EGL_MAX_PBUFFER_WIDTH, pbw,

 EGL_MAX_PBUFFER_HEIGHT, pbh,

 EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE,

 EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,

 EGL_NONE,

};

int iConfigs = 0;

eglChooseConfig(eglDisplay, attribs, &eglConfig, 1, &iConfigs);

eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig, nativeWindow, NULL);

eglContext = eglCreateContext(eglDisplay, eglConfig, NULL, NULL);

eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);

EGLint pbuffer_attribs[] = {

 EGL_WIDTH, pbw,

 EGL_HEIGHT, pbh,

 EGL_TEXTURE_TARGET, EGL_TEXTURE_2D,

 EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGBA,

 EGL_NONE

};

EGLSurface pbuffer = eglCreatePbufferSurface(eglDisplay, eglConfig, pbuffer_attribs);

GLuint pbuffer_texobj;

glEnable(GL_TEXTURE_2D);

glGenTextures(1, &pbuffer_texobj);

glBindTexture(GL_TEXTURE_2D, pbuffer_texobj);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

// ES1.1 only allows 4-component colors

GLfloat verts[] = {

 0.0f, 0.0f, 0.0f, // pos

 1.0f, 0.0f, 0.0f, 1.0f, // color

 1.0f, 0.0f, 0.0f, // pos

 0.0f, 1.0f, 0.0f, 1.0f, // color

 1.0f, 1.0f, 0.0f, // pos

 0.0f, 0.0f, 1.0f, 1.0f, // color

 };

GLubyte index[] = {0, 1, 2};

// textured quad

GLfloat verts2[] = {

 0, 0, 0,

 0, 0,

 1, 0, 0,

 1, 0,

 1, 1, 0,

 1, 1,

 0, 1, 0,

 0, 1,

 };

GLubyte index2[] = {0, 1, 3, 3, 1, 2};

float size;

bool running = true;

SDL_Event event;

while( running )

 {

 // handle all pending events

 while( SDL_PollEvent(&event) ) {

 switch (event.type) {

 case SDL_KEYDOWN: switch(event.key.keysym.sym) {

 case SDLK_ESCAPE: running = false; break;

 default: break;

 } break;

 case SDL_QUIT: running = false; break;

 default: break;

 }

 }

 // render to texture bound to our pbuffer

 eglMakeCurrent(eglDisplay, pbuffer, pbuffer, eglContext);

 glViewport(0, 0, pbw, pbh);

 glClearColor(1,0,1,1);

 glClear(GL_COLOR_BUFFER_BIT);

 glMatrixMode(GL_PROJECTION); glLoadIdentity();

 size = 0.6f;

 glOrthof(-size, size, -size, size, -1.0f, 1.0f);

 glMatrixMode(GL_MODELVIEW); glLoadIdentity();

 glEnableClientState(GL_VERTEX_ARRAY);

 glEnableClientState(GL_COLOR_ARRAY);

 glVertexPointer(3, GL_FLOAT, sizeof(GLfloat)*7, &verts[0]);

 glColorPointer(4, GL_FLOAT, sizeof(GLfloat)*7, &verts[3]);

 glDisable(GL_TEXTURE_2D);

 glPushMatrix();

 glRotatef(SDL_GetTicks() / 10.0f, 0, 0, 1);

 glTranslatef(-0.5f, -0.5f, 0);

 glDrawArrays(GL_TRIANGLES, 0, 3);

 glPopMatrix();

 // render textured quad using pbuffer texture

 eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);

 glBindTexture(GL_TEXTURE_2D, pbuffer_texobj);

 eglBindTexImage(eglDisplay, pbuffer, EGL_BACK_BUFFER);

 glViewport(0, 0, winw, winh);

 glClearColor(0,0,0,1);

 glClear(GL_COLOR_BUFFER_BIT);

 glMatrixMode(GL_PROJECTION); glLoadIdentity();

 size = 0.8f;

 glOrthof(-size, size, -size, size, -1.0f, 1.0f);

 glMatrixMode(GL_MODELVIEW); glLoadIdentity();

 glDisableClientState(GL_COLOR_ARRAY);

 glEnableClientState(GL_VERTEX_ARRAY);

 glEnableClientState(GL_TEXTURE_COORD_ARRAY);

 glVertexPointer(3, GL_FLOAT, sizeof(GLfloat)*5, &verts2[0]);

 glTexCoordPointer(2, GL_FLOAT, sizeof(GLfloat)*5, &verts2[3]);

 glEnable(GL_TEXTURE_2D);

 glColor4f(1,1,1,1);

 glBindTexture(GL_TEXTURE_2D, pbuffer_texobj);

 glPushMatrix();

 //glRotatef(-(float)SDL_GetTicks() / 100.0f, 0, 0, 1);

 glTranslatef(-0.5f, -0.5f, 0);

 glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, index2);

 glPopMatrix();

 eglReleaseTexImage(eglDisplay, pbuffer, EGL_BACK_BUFFER);

 glFlush();

 eglSwapBuffers(eglDisplay, eglSurface);

 SDL_Delay(1);

 }

eglReleaseTexImage(eglDisplay, pbuffer, EGL_BACK_BUFFER);

eglDestroySurface(eglDisplay, pbuffer);

glDeleteTextures(1, &pbuffer_texobj);

eglMakeCurrent(eglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);

eglTerminate(eglDisplay);

SDL_Quit();

return 0;

}

[/CODE] #include <iostream> #include <SDL/SDL.h> #include <SDL/SDL_syswm.h> #include <GLES/egl.h> #include <GLES/gl.h> using namespace std; int main(int argc, char* argv[]) { SDL_Init(SDL_INIT_EVERYTHING); const int winw = 320; const int winh = 240; SDL_SetVideoMode(winw, winh, 32, 0); // grab the window's HWND static SDL_SysWMinfo wmInfo; SDL_VERSION( &wmInfo.version ); SDL_GetWMInfo( &wmInfo ); NativeDisplayType nativeDisplay = (NativeDisplayType)GetDC(wmInfo.window); NativeWindowType nativeWindow = (NativeWindowType)wmInfo.window; const int pbw = 512; const int pbh = 512; EGLDisplay eglDisplay; EGLConfig eglConfig; EGLSurface eglSurface; EGLContext eglContext; eglDisplay = eglGetDisplay( nativeDisplay ); eglInitialize(eglDisplay, NULL, NULL); EGLint attribs[] = {     EGL_RED_SIZE,               5,     EGL_GREEN_SIZE,             5,     EGL_BLUE_SIZE,              5,     EGL_ALPHA_SIZE,             0,     EGL_DEPTH_SIZE,             16,     EGL_MAX_PBUFFER_WIDTH,      pbw,     EGL_MAX_PBUFFER_HEIGHT,     pbh,     EGL_BIND_TO_TEXTURE_RGBA,   EGL_TRUE,     EGL_SURFACE_TYPE,           EGL_WINDOW_BIT | EGL_PBUFFER_BIT,     EGL_NONE, }; int iConfigs = 0; eglChooseConfig(eglDisplay, attribs, &eglConfig, 1, &iConfigs); eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig, nativeWindow, NULL); eglContext = eglCreateContext(eglDisplay, eglConfig, NULL, NULL); eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext); EGLint pbuffer_attribs[] = {      EGL_WIDTH,                  pbw,      EGL_HEIGHT,                 pbh,      EGL_TEXTURE_TARGET,        EGL_TEXTURE_2D,      EGL_TEXTURE_FORMAT,        EGL_TEXTURE_RGBA,      EGL_NONE }; EGLSurface pbuffer = eglCreatePbufferSurface(eglDisplay, eglConfig, pbuffer_attribs); GLuint pbuffer_texobj; glEnable(GL_TEXTURE_2D); glGenTextures(1, &pbuffer_texobj); glBindTexture(GL_TEXTURE_2D, pbuffer_texobj); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); // ES1.1 only allows 4-component colors GLfloat verts[] = {     0.0f, 0.0f, 0.0f,           // pos     1.0f, 0.0f, 0.0f, 1.0f,     // color     1.0f, 0.0f, 0.0f,           // pos     0.0f, 1.0f, 0.0f, 1.0f,     // color     1.0f, 1.0f, 0.0f,           // pos     0.0f, 0.0f, 1.0f, 1.0f,     // color     }; GLubyte index[] = {0, 1, 2}; // textured quad GLfloat verts2[] = {     0, 0, 0,     0, 0,     1, 0, 0,     1, 0,     1, 1, 0,     1, 1,     0, 1, 0,     0, 1,     }; GLubyte index2[] = {0, 1, 3, 3, 1, 2}; float size; bool running = true; SDL_Event event; while( running )     {     // handle all pending events     while( SDL_PollEvent(&event) ) {         switch (event.type) {               case SDL_KEYDOWN: switch(event.key.keysym.sym) {                    case SDLK_ESCAPE: running = false; break;                    default: break;              } break;               case SDL_QUIT: running = false; break;               default: break;         }     }     // render to texture bound to our pbuffer     eglMakeCurrent(eglDisplay, pbuffer, pbuffer, eglContext);     glViewport(0, 0, pbw, pbh);     glClearColor(1,0,1,1);     glClear(GL_COLOR_BUFFER_BIT);     glMatrixMode(GL_PROJECTION); glLoadIdentity();     size = 0.6f;     glOrthof(-size, size, -size, size, -1.0f, 1.0f);     glMatrixMode(GL_MODELVIEW); glLoadIdentity();     glEnableClientState(GL_VERTEX_ARRAY);     glEnableClientState(GL_COLOR_ARRAY);     glVertexPointer(3, GL_FLOAT, sizeof(GLfloat)*7, &verts[0]);     glColorPointer(4, GL_FLOAT, sizeof(GLfloat)*7, &verts[3]);     glDisable(GL_TEXTURE_2D);     glPushMatrix();     glRotatef(SDL_GetTicks() / 10.0f, 0, 0, 1);     glTranslatef(-0.5f, -0.5f, 0);     glDrawArrays(GL_TRIANGLES, 0, 3);     glPopMatrix();     // render textured quad using pbuffer texture     eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);     glBindTexture(GL_TEXTURE_2D, pbuffer_texobj);     eglBindTexImage(eglDisplay, pbuffer, EGL_BACK_BUFFER);     glViewport(0, 0, winw, winh);     glClearColor(0,0,0,1);     glClear(GL_COLOR_BUFFER_BIT);     glMatrixMode(GL_PROJECTION); glLoadIdentity();     size = 0.8f;     glOrthof(-size, size, -size, size, -1.0f, 1.0f);     glMatrixMode(GL_MODELVIEW); glLoadIdentity();     glDisableClientState(GL_COLOR_ARRAY);     glEnableClientState(GL_VERTEX_ARRAY);     glEnableClientState(GL_TEXTURE_COORD_ARRAY);     glVertexPointer(3, GL_FLOAT, sizeof(GLfloat)*5, &verts2[0]);     glTexCoordPointer(2, GL_FLOAT, sizeof(GLfloat)*5, &verts2[3]);     glEnable(GL_TEXTURE_2D);     glColor4f(1,1,1,1);     glBindTexture(GL_TEXTURE_2D, pbuffer_texobj);     glPushMatrix();     //glRotatef(-(float)SDL_GetTicks() / 100.0f, 0, 0, 1);     glTranslatef(-0.5f, -0.5f, 0);     glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, index2);     glPopMatrix();     eglReleaseTexImage(eglDisplay, pbuffer, EGL_BACK_BUFFER);     glFlush();     eglSwapBuffers(eglDisplay, eglSurface);     SDL_Delay(1);     } eglReleaseTexImage(eglDisplay, pbuffer, EGL_BACK_BUFFER); eglDestroySurface(eglDisplay, pbuffer); glDeleteTextures(1, &pbuffer_texobj); eglMakeCurrent(eglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); eglTerminate(eglDisplay); SDL_Quit(); return 0; }

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PBuffer render-to-texture problem...

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