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// Copyright 2016 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#define GL_GLEXT_PROTOTYPES
#include <assert.h>
#include <GLES/gl.h>
#include <GLES/glext.h>
#include <GLES3/gl3.h>
#include <stdio.h>
#include <emscripten.h>
#include <emscripten/html5.h>
#define GL_CALL( x ) \
{ \
x; \
GLenum error = glGetError(); \
if( error != GL_NO_ERROR ) \
printf( "GL ERROR: %d, %s\n", (int)error, #x ); \
} \
bool IsFramebufferValid( GLenum target )
{
// get framebuffer status from opengl
GLenum status = glCheckFramebufferStatus( target );
// debug output of the framebuffer status
switch( status )
{
case GL_FRAMEBUFFER_COMPLETE:
printf("**** Framebuffer COMPLETE\n");
break;
case GL_FRAMEBUFFER_UNDEFINED:
printf("**** Target is the default framebuffer, but the default framebuffer does not exist.\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
printf("**** Any of the framebuffer attachment points are framebuffer incomplete.\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
printf("**** The framebuffer does not have at least one image attached to it.\n");
break;
case GL_FRAMEBUFFER_UNSUPPORTED:
printf("**** the combination of internal formats of the attached images violates an "
"implementation-dependent set of restrictions.\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
printf("**** The value of GL_RENDERBUFFER_SAMPLES is not the same for all attached renderbuffers; "
"if the value of GL_TEXTURE_SAMPLES is the not same for all attached textures; or, if "
"the attached images are a mix of renderbuffers and textures, the value of "
"GL_RENDERBUFFER_SAMPLES does not match the value of GL_TEXTURE_SAMPLES."
"Or the value of GL_TEXTURE_FIXED_SAMPLE_LOCATIONS is not the same for all attached "
"textures; or, if the attached images are a mix of renderbuffers and textures, the "
"value of GL_TEXTURE_FIXED_SAMPLE_LOCATIONS is not GL_TRUE for all attached textures.\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
printf("**** GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS.\n");
break;
default:
printf("**** IsFramebufferValid() Unknown validation error: %#08x\n", (uint32_t)status );
break;
}
return status == GL_FRAMEBUFFER_COMPLETE;
}
int main()
{
emscripten_set_canvas_element_size( "#canvas", 100, 100 );
EmscriptenWebGLContextAttributes attrs;
emscripten_webgl_init_context_attributes(&attrs);
attrs.enableExtensionsByDefault = 1;
attrs.majorVersion = 2;
attrs.minorVersion = 0;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context( "#canvas", &attrs );
if (!context)
{
attrs.majorVersion = 1;
context = emscripten_webgl_create_context( "#canvas", &attrs );
assert(context);
// We did not have WebGL 2, but were able to init WebGL 1? In that case,
// gracefully skip this test with the current browser not supporting
// this one.
printf("Skipping test: WebGL 2.0 is not available.\n");
return 0;
}
emscripten_webgl_make_context_current(context);
// Textures
//
int mips = 10;
int sizeO = 512;
unsigned short* data = new unsigned short[ 512 * 512 * 4 ];
//memset( data, 0, 512 * 512 * 4 );
// Create texture 1
GLuint tex1;
GL_CALL( glGenTextures( 1, &tex1 ) );
GL_CALL( glBindTexture( GL_TEXTURE_CUBE_MAP, tex1 ) );
for( int i=0; i<6; ++i )
{
GL_CALL( glTexImage2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, 0, GL_RGBA16F, sizeO, sizeO, 0, GL_RGBA, GL_HALF_FLOAT, NULL ) );
}
GL_CALL( glGenerateMipmap( GL_TEXTURE_CUBE_MAP ) );
for( int i=0; i<6; ++i )
GL_CALL( glTexSubImage2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, 0, 0, 0, sizeO, sizeO, GL_RGBA, GL_HALF_FLOAT, data ) );
delete [] data;
// Create texture 2
GLuint tex2;
GL_CALL( glGenTextures( 1, &tex2 ) );
GL_CALL( glBindTexture( GL_TEXTURE_CUBE_MAP, tex2 ) );
for( int i=0; i<6; ++i )
{
GL_CALL( glTexImage2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, 0, GL_RGBA16F, sizeO, sizeO, 0, GL_RGBA, GL_HALF_FLOAT, NULL ) );
}
GL_CALL( glGenerateMipmap( GL_TEXTURE_CUBE_MAP ) );
// FBOs
//
// Create FBO 1
GLuint fbo1;
GL_CALL( glGenFramebuffers( 1, &fbo1 ) );
GL_CALL( glBindFramebuffer( GL_FRAMEBUFFER, fbo1 ) );
for( int level=0; level<mips; ++level )
{
for( int i=0; i<6; ++i )
{
GL_CALL( glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, tex1, level ) );
}
}
IsFramebufferValid( GL_FRAMEBUFFER );
// Create FBO 2
GLuint fbo2;
GL_CALL( glGenFramebuffers( 1, &fbo2 ) );
GL_CALL( glBindFramebuffer( GL_FRAMEBUFFER, fbo2 ) );
for( int level=0; level<mips; ++level )
{
for( int i=0; i<6; ++i )
{
GL_CALL( glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, tex2, level ) );
glViewport( 0, 0, sizeO, sizeO );
}
}
IsFramebufferValid( GL_FRAMEBUFFER );
// Copy FBO 1 to 2
int nw = sizeO;
GL_CALL( glBindFramebuffer( GL_READ_FRAMEBUFFER, fbo1 ) );
GL_CALL( glBindFramebuffer( GL_DRAW_FRAMEBUFFER, fbo2 ) );
for( int level=0; level<mips; ++level )
{
for( int i=0; i<6; ++i )
{
GL_CALL( glFramebufferTexture2D( GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, tex1, level ) );
GL_CALL( glFramebufferTexture2D( GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, tex2, level ) );
glViewport( 0, 0, nw, nw );
GL_CALL( glBlitFramebuffer( 0, 0, nw, nw, 0, 0, nw, nw, GL_COLOR_BUFFER_BIT, GL_NEAREST ) );
}
nw /= 2;
}
GL_CALL( glBindFramebuffer( GL_READ_FRAMEBUFFER, 0 ) );
GL_CALL( glBindFramebuffer( GL_DRAW_FRAMEBUFFER, 0 ) );
return 0;
}
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