static WarpProgram BuildWarpProg( const char * vertex, const char * fragment )
{
WarpProgram wp;
WarpProgram_Create( &wp, vertex, fragment );
return wp;
}
// Called by TimeWarp before adding the KHR sync object.
void ImageServer::EnterWarpSwap( int eyeTexture )
{
ImageServerRequest request = Request.GetState();
if ( request.Sequence <= SequenceCaptured )
{
return;
}
SequenceCaptured = request.Sequence;
// create GL objects if necessary
if ( !ResampleProg.program )
{
WarpProgram_Create( &ResampleProg,
"uniform highp mat4 Mvpm;\n"
"attribute vec4 Position;\n"
"attribute vec2 TexCoord;\n"
"varying highp vec2 oTexCoord;\n"
"void main()\n"
"{\n"
" gl_Position = Position;\n"
" oTexCoord = vec2( TexCoord.x, 1.0 - TexCoord.y );\n" // need to flip Y
"}\n"
,
"uniform sampler2D Texture0;\n"
"varying highp vec2 oTexCoord;\n"
"void main()\n"
"{\n"
" gl_FragColor = texture2D( Texture0, oTexCoord );\n"
"}\n"
);
}
if ( !Quad.vertexArrayObject )
{
WarpGeometry_CreateQuad( &Quad );
}
// If resolution has changed, delete and reallocate the buffers
// These might still be in use, do we trust the driver or try to
// deal with it ourselves?
if ( request.Resolution != CurrentResolution )
{
CurrentResolution = request.Resolution;
FreeBuffers();
}
// Allocate any resources we need
if ( !ResampleRenderBuffer )
{
LOG( "Alloc %i res renderbuffer", CurrentResolution );
glGenRenderbuffers( 1, &ResampleRenderBuffer );
glBindRenderbuffer( GL_RENDERBUFFER, ResampleRenderBuffer );
glRenderbufferStorage( GL_RENDERBUFFER, GL_RGB565, CurrentResolution, CurrentResolution );
}
if ( !FrameBufferObject )
{
LOG( "Alloc FrameBufferObject" );
glGenFramebuffers( 1, &FrameBufferObject );
glBindFramebuffer( GL_FRAMEBUFFER, FrameBufferObject );
glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, ResampleRenderBuffer );
const GLenum status = glCheckFramebufferStatus( GL_FRAMEBUFFER );
if (status != GL_FRAMEBUFFER_COMPLETE )
{
LOG( "FBO is not complete: 0x%x", status );
}
}
if ( !PixelBufferObject )
{
LOG( "Alloc PixelBufferObject" );
glGenBuffers( 1, &PixelBufferObject );
glBindBuffer( GL_PIXEL_PACK_BUFFER, PixelBufferObject );
glBufferData( GL_PIXEL_PACK_BUFFER, CurrentResolution*CurrentResolution*2, NULL,
GL_DYNAMIC_READ );
glBindBuffer( GL_PIXEL_PACK_BUFFER, 0 );
}
// Render the FBO
glBindFramebuffer( GL_FRAMEBUFFER, FrameBufferObject );
glDisable( GL_DEPTH_TEST );
glDisable( GL_SCISSOR_TEST );
GL_InvalidateFramebuffer( INV_FBO, true, false );
glViewport( 0, 0, CurrentResolution, CurrentResolution );
glActiveTexture( GL_TEXTURE0 );
glBindTexture( GL_TEXTURE_2D, eyeTexture );
glUseProgram( ResampleProg.program );
glBindVertexArrayOES_( Quad.vertexArrayObject );
glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, NULL );
glBindVertexArrayOES_( 0 );
glUseProgram( 0 );
// unmap the previous PBO mapping
if ( PboMappedAddress )
{
glBindBuffer( GL_PIXEL_PACK_BUFFER, PixelBufferObject );
glUnmapBuffer_( GL_PIXEL_PACK_BUFFER );
glBindBuffer( GL_PIXEL_PACK_BUFFER, 0 );
PboMappedAddress = NULL;
}
// Issue an async read into our PBO
#if 1
glBindBuffer( GL_PIXEL_PACK_BUFFER, PixelBufferObject );
glReadPixels( 0, 0, CurrentResolution, CurrentResolution, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 0 );
// back to normal memory read operations
glBindBuffer( GL_PIXEL_PACK_BUFFER, 0 );
#else
GL_CheckErrors( "before read" );
static short pixels[256*256];
glReadPixels( 0, 0, CurrentResolution, CurrentResolution, GL_RGB,
GL_UNSIGNED_SHORT_5_6_5, (GLvoid *)pixels );
ImageServerResponse response;
response.Data = (void *)pixels;
response.Resolution = CurrentResolution;
response.Sequence = request.Sequence;
Response.SetState( response );
#endif
glBindFramebuffer( GL_FRAMEBUFFER, 0 );
GL_CheckErrors( "after read" );
CountdownToSend = 2;
}
