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/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portionsalloc
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include "main/enums.h"
#include "main/state.h"
#include "main/bufferobj.h"
#include "main/context.h"
#include "swrast/swrast.h"
#include "intel_context.h"
#include "intel_pixel.h"
#include "intel_regions.h"
#define FILE_DEBUG_FLAG DEBUG_PIXEL
static GLenum
effective_func(GLenum func, GLboolean src_alpha_is_one)
{
if (src_alpha_is_one) {
if (func == GL_SRC_ALPHA)
return GL_ONE;
if (func == GL_ONE_MINUS_SRC_ALPHA)
return GL_ZERO;
}
return func;
}
/**
* Check if any fragment operations are in effect which might effect
* glDraw/CopyPixels.
*/
GLboolean
intel_check_blit_fragment_ops(GLcontext * ctx, GLboolean src_alpha_is_one)
{
if (ctx->NewState)
_mesa_update_state(ctx);
if (ctx->FragmentProgram._Enabled) {
DBG("fallback due to fragment program\n");
return GL_FALSE;
}
if (ctx->Color.BlendEnabled &&
(effective_func(ctx->Color.BlendSrcRGB, src_alpha_is_one) != GL_ONE ||
effective_func(ctx->Color.BlendDstRGB, src_alpha_is_one) != GL_ZERO ||
ctx->Color.BlendEquationRGB != GL_FUNC_ADD ||
effective_func(ctx->Color.BlendSrcA, src_alpha_is_one) != GL_ONE ||
effective_func(ctx->Color.BlendDstA, src_alpha_is_one) != GL_ZERO ||
ctx->Color.BlendEquationA != GL_FUNC_ADD)) {
DBG("fallback due to blend\n");
return GL_FALSE;
}
if (ctx->Texture._EnabledUnits) {
DBG("fallback due to texturing\n");
return GL_FALSE;
}
if (!(ctx->Color.ColorMask[0][0] &&
ctx->Color.ColorMask[0][1] &&
ctx->Color.ColorMask[0][2] &&
ctx->Color.ColorMask[0][3])) {
DBG("fallback due to color masking\n");
return GL_FALSE;
}
if (ctx->Color.AlphaEnabled) {
DBG("fallback due to alpha\n");
return GL_FALSE;
}
if (ctx->Depth.Test) {
DBG("fallback due to depth test\n");
return GL_FALSE;
}
if (ctx->Fog.Enabled) {
DBG("fallback due to fog\n");
return GL_FALSE;
}
if (ctx->_ImageTransferState) {
DBG("fallback due to image transfer\n");
return GL_FALSE;
}
if (ctx->Stencil._Enabled) {
DBG("fallback due to image stencil\n");
return GL_FALSE;
}
if (ctx->RenderMode != GL_RENDER) {
DBG("fallback due to render mode\n");
return GL_FALSE;
}
return GL_TRUE;
}
/* The intel_region struct doesn't really do enough to capture the
* format of the pixels in the region. For now this code assumes that
* the region is a display surface and hence is either ARGB8888 or
* RGB565.
* XXX FBO: If we'd pass in the intel_renderbuffer instead of region, we'd
* know the buffer's pixel format.
*
* \param format as given to glDraw/ReadPixels
* \param type as given to glDraw/ReadPixels
*/
GLboolean
intel_check_blit_format(struct intel_region * region,
GLenum format, GLenum type)
{
if (region->cpp == 4 &&
(type == GL_UNSIGNED_INT_8_8_8_8_REV ||
type == GL_UNSIGNED_BYTE) && format == GL_BGRA) {
return GL_TRUE;
}
if (region->cpp == 2 &&
type == GL_UNSIGNED_SHORT_5_6_5_REV && format == GL_BGR) {
return GL_TRUE;
}
if (INTEL_DEBUG & DEBUG_PIXEL)
fprintf(stderr, "%s: bad format for blit (cpp %d, type %s format %s)\n",
__FUNCTION__, region->cpp,
_mesa_lookup_enum_by_nr(type), _mesa_lookup_enum_by_nr(format));
return GL_FALSE;
}
void
intelInitPixelFuncs(struct dd_function_table *functions)
{
functions->Accum = _swrast_Accum;
if (!getenv("INTEL_NO_BLIT")) {
functions->Bitmap = intelBitmap;
functions->CopyPixels = intelCopyPixels;
functions->DrawPixels = intelDrawPixels;
}
functions->ReadPixels = intelReadPixels;
}
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