0,0 → 1,1006 |
/* |
* Mesa 3-D graphics library |
* |
* Copyright (C) 1999-2008 Brian Paul 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, sublicense, |
* 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 shall be included |
* in all copies or substantial portions 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 NONINFRINGEMENT. IN NO EVENT SHALL |
* THE AUTHORS OR COPYRIGHT HOLDERS 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. |
*/ |
|
|
/** |
* \file swrast/s_blend.c |
* \brief software blending. |
* \author Brian Paul |
* |
* Only a few blend modes have been optimized (min, max, transparency, add) |
* more optimized cases can easily be added if needed. |
* Celestia uses glBlendFunc(GL_SRC_ALPHA, GL_ONE), for example. |
*/ |
|
|
|
#include "main/glheader.h" |
#include "main/context.h" |
#include "main/colormac.h" |
#include "main/macros.h" |
|
#include "s_blend.h" |
#include "s_context.h" |
#include "s_span.h" |
|
|
#if defined(USE_MMX_ASM) |
#include "x86/mmx.h" |
#include "x86/common_x86_asm.h" |
#endif |
|
|
/** |
* Integer divide by 255 |
* Declare "int divtemp" before using. |
* This satisfies Glean and should be reasonably fast. |
* Contributed by Nathan Hand. |
*/ |
#define DIV255(X) (divtemp = (X), ((divtemp << 8) + divtemp + 256) >> 16) |
|
|
|
/** |
* Special case for glBlendFunc(GL_ZERO, GL_ONE). |
* No-op means the framebuffer values remain unchanged. |
* Any chanType ok. |
*/ |
static void |
blend_noop(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLint bytes; |
|
assert(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].SrcRGB == GL_ZERO); |
assert(ctx->Color.Blend[0].DstRGB == GL_ONE); |
(void) ctx; |
|
/* just memcpy */ |
if (chanType == GL_UNSIGNED_BYTE) |
bytes = 4 * n * sizeof(GLubyte); |
else if (chanType == GL_UNSIGNED_SHORT) |
bytes = 4 * n * sizeof(GLushort); |
else |
bytes = 4 * n * sizeof(GLfloat); |
|
memcpy(src, dst, bytes); |
} |
|
|
/** |
* Special case for glBlendFunc(GL_ONE, GL_ZERO) |
* Any chanType ok. |
*/ |
static void |
blend_replace(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
assert(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].SrcRGB == GL_ONE); |
assert(ctx->Color.Blend[0].DstRGB == GL_ZERO); |
(void) ctx; |
(void) n; |
(void) mask; |
(void) src; |
(void) dst; |
} |
|
|
/** |
* Common transparency blending mode: |
* glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA). |
*/ |
static void |
blend_transparency_ubyte(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLubyte (*rgba)[4] = (GLubyte (*)[4]) src; |
const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst; |
GLuint i; |
|
assert(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA); |
assert(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA); |
assert(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA); |
assert(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA); |
assert(chanType == GL_UNSIGNED_BYTE); |
|
(void) ctx; |
|
for (i = 0; i < n; i++) { |
if (mask[i]) { |
const GLint t = rgba[i][ACOMP]; /* t is in [0, 255] */ |
if (t == 0) { |
/* 0% alpha */ |
COPY_4UBV(rgba[i], dest[i]); |
} |
else if (t != 255) { |
GLint divtemp; |
const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP]; |
const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP]; |
const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP]; |
const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP]; |
assert(r <= 255); |
assert(g <= 255); |
assert(b <= 255); |
assert(a <= 255); |
rgba[i][RCOMP] = (GLubyte) r; |
rgba[i][GCOMP] = (GLubyte) g; |
rgba[i][BCOMP] = (GLubyte) b; |
rgba[i][ACOMP] = (GLubyte) a; |
} |
} |
} |
} |
|
|
static void |
blend_transparency_ushort(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLushort (*rgba)[4] = (GLushort (*)[4]) src; |
const GLushort (*dest)[4] = (const GLushort (*)[4]) dst; |
GLuint i; |
|
assert(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA); |
assert(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA); |
assert(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA); |
assert(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA); |
assert(chanType == GL_UNSIGNED_SHORT); |
|
(void) ctx; |
|
for (i = 0; i < n; i++) { |
if (mask[i]) { |
const GLint t = rgba[i][ACOMP]; |
if (t == 0) { |
/* 0% alpha */ |
COPY_4V(rgba[i], dest[i]); |
} |
else if (t != 65535) { |
const GLfloat tt = (GLfloat) t / 65535.0F; |
GLushort r = (GLushort) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]); |
GLushort g = (GLushort) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]); |
GLushort b = (GLushort) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]); |
GLushort a = (GLushort) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]); |
ASSIGN_4V(rgba[i], r, g, b, a); |
} |
} |
} |
} |
|
|
static void |
blend_transparency_float(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLfloat (*rgba)[4] = (GLfloat (*)[4]) src; |
const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst; |
GLuint i; |
|
assert(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA); |
assert(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA); |
assert(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA); |
assert(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA); |
assert(chanType == GL_FLOAT); |
|
(void) ctx; |
|
for (i = 0; i < n; i++) { |
if (mask[i]) { |
const GLfloat t = rgba[i][ACOMP]; /* t in [0, 1] */ |
if (t == 0.0F) { |
/* 0% alpha */ |
COPY_4V(rgba[i], dest[i]); |
} |
else if (t != 1.0F) { |
GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * t + dest[i][RCOMP]; |
GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * t + dest[i][GCOMP]; |
GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * t + dest[i][BCOMP]; |
GLfloat a = (rgba[i][ACOMP] - dest[i][ACOMP]) * t + dest[i][ACOMP]; |
ASSIGN_4V(rgba[i], r, g, b, a); |
} |
} |
} |
} |
|
|
|
/** |
* Add src and dest: glBlendFunc(GL_ONE, GL_ONE). |
* Any chanType ok. |
*/ |
static void |
blend_add(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLuint i; |
|
assert(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD); |
assert(ctx->Color.Blend[0].SrcRGB == GL_ONE); |
assert(ctx->Color.Blend[0].DstRGB == GL_ONE); |
(void) ctx; |
|
if (chanType == GL_UNSIGNED_BYTE) { |
GLubyte (*rgba)[4] = (GLubyte (*)[4]) src; |
const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
GLint r = rgba[i][RCOMP] + dest[i][RCOMP]; |
GLint g = rgba[i][GCOMP] + dest[i][GCOMP]; |
GLint b = rgba[i][BCOMP] + dest[i][BCOMP]; |
GLint a = rgba[i][ACOMP] + dest[i][ACOMP]; |
rgba[i][RCOMP] = (GLubyte) MIN2( r, 255 ); |
rgba[i][GCOMP] = (GLubyte) MIN2( g, 255 ); |
rgba[i][BCOMP] = (GLubyte) MIN2( b, 255 ); |
rgba[i][ACOMP] = (GLubyte) MIN2( a, 255 ); |
} |
} |
} |
else if (chanType == GL_UNSIGNED_SHORT) { |
GLushort (*rgba)[4] = (GLushort (*)[4]) src; |
const GLushort (*dest)[4] = (const GLushort (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
GLint r = rgba[i][RCOMP] + dest[i][RCOMP]; |
GLint g = rgba[i][GCOMP] + dest[i][GCOMP]; |
GLint b = rgba[i][BCOMP] + dest[i][BCOMP]; |
GLint a = rgba[i][ACOMP] + dest[i][ACOMP]; |
rgba[i][RCOMP] = (GLshort) MIN2( r, 255 ); |
rgba[i][GCOMP] = (GLshort) MIN2( g, 255 ); |
rgba[i][BCOMP] = (GLshort) MIN2( b, 255 ); |
rgba[i][ACOMP] = (GLshort) MIN2( a, 255 ); |
} |
} |
} |
else { |
GLfloat (*rgba)[4] = (GLfloat (*)[4]) src; |
const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst; |
assert(chanType == GL_FLOAT); |
for (i=0;i<n;i++) { |
if (mask[i]) { |
/* don't RGB clamp to max */ |
rgba[i][RCOMP] += dest[i][RCOMP]; |
rgba[i][GCOMP] += dest[i][GCOMP]; |
rgba[i][BCOMP] += dest[i][BCOMP]; |
rgba[i][ACOMP] += dest[i][ACOMP]; |
} |
} |
} |
} |
|
|
|
/** |
* Blend min function. |
* Any chanType ok. |
*/ |
static void |
blend_min(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLuint i; |
assert(ctx->Color.Blend[0].EquationRGB == GL_MIN); |
assert(ctx->Color.Blend[0].EquationA == GL_MIN); |
(void) ctx; |
|
if (chanType == GL_UNSIGNED_BYTE) { |
GLubyte (*rgba)[4] = (GLubyte (*)[4]) src; |
const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] ); |
rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] ); |
rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] ); |
rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] ); |
} |
} |
} |
else if (chanType == GL_UNSIGNED_SHORT) { |
GLushort (*rgba)[4] = (GLushort (*)[4]) src; |
const GLushort (*dest)[4] = (const GLushort (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] ); |
rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] ); |
rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] ); |
rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] ); |
} |
} |
} |
else { |
GLfloat (*rgba)[4] = (GLfloat (*)[4]) src; |
const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst; |
assert(chanType == GL_FLOAT); |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] ); |
rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] ); |
rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] ); |
rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] ); |
} |
} |
} |
} |
|
|
/** |
* Blend max function. |
* Any chanType ok. |
*/ |
static void |
blend_max(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLuint i; |
assert(ctx->Color.Blend[0].EquationRGB == GL_MAX); |
assert(ctx->Color.Blend[0].EquationA == GL_MAX); |
(void) ctx; |
|
if (chanType == GL_UNSIGNED_BYTE) { |
GLubyte (*rgba)[4] = (GLubyte (*)[4]) src; |
const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] ); |
rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] ); |
rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] ); |
rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] ); |
} |
} |
} |
else if (chanType == GL_UNSIGNED_SHORT) { |
GLushort (*rgba)[4] = (GLushort (*)[4]) src; |
const GLushort (*dest)[4] = (const GLushort (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] ); |
rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] ); |
rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] ); |
rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] ); |
} |
} |
} |
else { |
GLfloat (*rgba)[4] = (GLfloat (*)[4]) src; |
const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst; |
assert(chanType == GL_FLOAT); |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] ); |
rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] ); |
rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] ); |
rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] ); |
} |
} |
} |
} |
|
|
|
/** |
* Modulate: result = src * dest |
* Any chanType ok. |
*/ |
static void |
blend_modulate(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLvoid *src, const GLvoid *dst, GLenum chanType) |
{ |
GLuint i; |
(void) ctx; |
|
if (chanType == GL_UNSIGNED_BYTE) { |
GLubyte (*rgba)[4] = (GLubyte (*)[4]) src; |
const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
GLint divtemp; |
rgba[i][RCOMP] = DIV255(rgba[i][RCOMP] * dest[i][RCOMP]); |
rgba[i][GCOMP] = DIV255(rgba[i][GCOMP] * dest[i][GCOMP]); |
rgba[i][BCOMP] = DIV255(rgba[i][BCOMP] * dest[i][BCOMP]); |
rgba[i][ACOMP] = DIV255(rgba[i][ACOMP] * dest[i][ACOMP]); |
} |
} |
} |
else if (chanType == GL_UNSIGNED_SHORT) { |
GLushort (*rgba)[4] = (GLushort (*)[4]) src; |
const GLushort (*dest)[4] = (const GLushort (*)[4]) dst; |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16; |
rgba[i][GCOMP] = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16; |
rgba[i][BCOMP] = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16; |
rgba[i][ACOMP] = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16; |
} |
} |
} |
else { |
GLfloat (*rgba)[4] = (GLfloat (*)[4]) src; |
const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst; |
assert(chanType == GL_FLOAT); |
for (i=0;i<n;i++) { |
if (mask[i]) { |
rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP]; |
rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP]; |
rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP]; |
rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP]; |
} |
} |
} |
} |
|
|
/** |
* Do any blending operation, using floating point. |
* \param n number of pixels |
* \param mask fragment writemask array |
* \param rgba array of incoming (and modified) pixels |
* \param dest array of pixels from the dest color buffer |
*/ |
static void |
blend_general_float(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
GLfloat rgba[][4], GLfloat dest[][4], |
GLenum chanType) |
{ |
GLuint i; |
|
for (i = 0; i < n; i++) { |
if (mask[i]) { |
/* Incoming/source Color */ |
const GLfloat Rs = rgba[i][RCOMP]; |
const GLfloat Gs = rgba[i][GCOMP]; |
const GLfloat Bs = rgba[i][BCOMP]; |
const GLfloat As = rgba[i][ACOMP]; |
|
/* Frame buffer/dest color */ |
const GLfloat Rd = dest[i][RCOMP]; |
const GLfloat Gd = dest[i][GCOMP]; |
const GLfloat Bd = dest[i][BCOMP]; |
const GLfloat Ad = dest[i][ACOMP]; |
|
GLfloat sR, sG, sB, sA; /* Source factor */ |
GLfloat dR, dG, dB, dA; /* Dest factor */ |
GLfloat r, g, b, a; /* result color */ |
|
/* XXX for the case of constant blend terms we could init |
* the sX and dX variables just once before the loop. |
*/ |
|
/* Source RGB factor */ |
switch (ctx->Color.Blend[0].SrcRGB) { |
case GL_ZERO: |
sR = sG = sB = 0.0F; |
break; |
case GL_ONE: |
sR = sG = sB = 1.0F; |
break; |
case GL_DST_COLOR: |
sR = Rd; |
sG = Gd; |
sB = Bd; |
break; |
case GL_ONE_MINUS_DST_COLOR: |
sR = 1.0F - Rd; |
sG = 1.0F - Gd; |
sB = 1.0F - Bd; |
break; |
case GL_SRC_ALPHA: |
sR = sG = sB = As; |
break; |
case GL_ONE_MINUS_SRC_ALPHA: |
sR = sG = sB = 1.0F - As; |
break; |
case GL_DST_ALPHA: |
sR = sG = sB = Ad; |
break; |
case GL_ONE_MINUS_DST_ALPHA: |
sR = sG = sB = 1.0F - Ad; |
break; |
case GL_SRC_ALPHA_SATURATE: |
if (As < 1.0F - Ad) { |
sR = sG = sB = As; |
} |
else { |
sR = sG = sB = 1.0F - Ad; |
} |
break; |
case GL_CONSTANT_COLOR: |
sR = ctx->Color.BlendColor[0]; |
sG = ctx->Color.BlendColor[1]; |
sB = ctx->Color.BlendColor[2]; |
break; |
case GL_ONE_MINUS_CONSTANT_COLOR: |
sR = 1.0F - ctx->Color.BlendColor[0]; |
sG = 1.0F - ctx->Color.BlendColor[1]; |
sB = 1.0F - ctx->Color.BlendColor[2]; |
break; |
case GL_CONSTANT_ALPHA: |
sR = sG = sB = ctx->Color.BlendColor[3]; |
break; |
case GL_ONE_MINUS_CONSTANT_ALPHA: |
sR = sG = sB = 1.0F - ctx->Color.BlendColor[3]; |
break; |
case GL_SRC_COLOR: |
sR = Rs; |
sG = Gs; |
sB = Bs; |
break; |
case GL_ONE_MINUS_SRC_COLOR: |
sR = 1.0F - Rs; |
sG = 1.0F - Gs; |
sB = 1.0F - Bs; |
break; |
default: |
/* this should never happen */ |
_mesa_problem(ctx, "Bad blend source RGB factor in blend_general_float"); |
return; |
} |
|
/* Source Alpha factor */ |
switch (ctx->Color.Blend[0].SrcA) { |
case GL_ZERO: |
sA = 0.0F; |
break; |
case GL_ONE: |
sA = 1.0F; |
break; |
case GL_DST_COLOR: |
sA = Ad; |
break; |
case GL_ONE_MINUS_DST_COLOR: |
sA = 1.0F - Ad; |
break; |
case GL_SRC_ALPHA: |
sA = As; |
break; |
case GL_ONE_MINUS_SRC_ALPHA: |
sA = 1.0F - As; |
break; |
case GL_DST_ALPHA: |
sA = Ad; |
break; |
case GL_ONE_MINUS_DST_ALPHA: |
sA = 1.0F - Ad; |
break; |
case GL_SRC_ALPHA_SATURATE: |
sA = 1.0; |
break; |
case GL_CONSTANT_COLOR: |
sA = ctx->Color.BlendColor[3]; |
break; |
case GL_ONE_MINUS_CONSTANT_COLOR: |
sA = 1.0F - ctx->Color.BlendColor[3]; |
break; |
case GL_CONSTANT_ALPHA: |
sA = ctx->Color.BlendColor[3]; |
break; |
case GL_ONE_MINUS_CONSTANT_ALPHA: |
sA = 1.0F - ctx->Color.BlendColor[3]; |
break; |
case GL_SRC_COLOR: |
sA = As; |
break; |
case GL_ONE_MINUS_SRC_COLOR: |
sA = 1.0F - As; |
break; |
default: |
/* this should never happen */ |
sA = 0.0F; |
_mesa_problem(ctx, "Bad blend source A factor in blend_general_float"); |
return; |
} |
|
/* Dest RGB factor */ |
switch (ctx->Color.Blend[0].DstRGB) { |
case GL_ZERO: |
dR = dG = dB = 0.0F; |
break; |
case GL_ONE: |
dR = dG = dB = 1.0F; |
break; |
case GL_SRC_COLOR: |
dR = Rs; |
dG = Gs; |
dB = Bs; |
break; |
case GL_ONE_MINUS_SRC_COLOR: |
dR = 1.0F - Rs; |
dG = 1.0F - Gs; |
dB = 1.0F - Bs; |
break; |
case GL_SRC_ALPHA: |
dR = dG = dB = As; |
break; |
case GL_ONE_MINUS_SRC_ALPHA: |
dR = dG = dB = 1.0F - As; |
break; |
case GL_DST_ALPHA: |
dR = dG = dB = Ad; |
break; |
case GL_ONE_MINUS_DST_ALPHA: |
dR = dG = dB = 1.0F - Ad; |
break; |
case GL_CONSTANT_COLOR: |
dR = ctx->Color.BlendColor[0]; |
dG = ctx->Color.BlendColor[1]; |
dB = ctx->Color.BlendColor[2]; |
break; |
case GL_ONE_MINUS_CONSTANT_COLOR: |
dR = 1.0F - ctx->Color.BlendColor[0]; |
dG = 1.0F - ctx->Color.BlendColor[1]; |
dB = 1.0F - ctx->Color.BlendColor[2]; |
break; |
case GL_CONSTANT_ALPHA: |
dR = dG = dB = ctx->Color.BlendColor[3]; |
break; |
case GL_ONE_MINUS_CONSTANT_ALPHA: |
dR = dG = dB = 1.0F - ctx->Color.BlendColor[3]; |
break; |
case GL_DST_COLOR: |
dR = Rd; |
dG = Gd; |
dB = Bd; |
break; |
case GL_ONE_MINUS_DST_COLOR: |
dR = 1.0F - Rd; |
dG = 1.0F - Gd; |
dB = 1.0F - Bd; |
break; |
default: |
/* this should never happen */ |
dR = dG = dB = 0.0F; |
_mesa_problem(ctx, "Bad blend dest RGB factor in blend_general_float"); |
return; |
} |
|
/* Dest Alpha factor */ |
switch (ctx->Color.Blend[0].DstA) { |
case GL_ZERO: |
dA = 0.0F; |
break; |
case GL_ONE: |
dA = 1.0F; |
break; |
case GL_SRC_COLOR: |
dA = As; |
break; |
case GL_ONE_MINUS_SRC_COLOR: |
dA = 1.0F - As; |
break; |
case GL_SRC_ALPHA: |
dA = As; |
break; |
case GL_ONE_MINUS_SRC_ALPHA: |
dA = 1.0F - As; |
break; |
case GL_DST_ALPHA: |
dA = Ad; |
break; |
case GL_ONE_MINUS_DST_ALPHA: |
dA = 1.0F - Ad; |
break; |
case GL_CONSTANT_COLOR: |
dA = ctx->Color.BlendColor[3]; |
break; |
case GL_ONE_MINUS_CONSTANT_COLOR: |
dA = 1.0F - ctx->Color.BlendColor[3]; |
break; |
case GL_CONSTANT_ALPHA: |
dA = ctx->Color.BlendColor[3]; |
break; |
case GL_ONE_MINUS_CONSTANT_ALPHA: |
dA = 1.0F - ctx->Color.BlendColor[3]; |
break; |
case GL_DST_COLOR: |
dA = Ad; |
break; |
case GL_ONE_MINUS_DST_COLOR: |
dA = 1.0F - Ad; |
break; |
default: |
/* this should never happen */ |
dA = 0.0F; |
_mesa_problem(ctx, "Bad blend dest A factor in blend_general_float"); |
return; |
} |
|
/* compute the blended RGB */ |
switch (ctx->Color.Blend[0].EquationRGB) { |
case GL_FUNC_ADD: |
r = Rs * sR + Rd * dR; |
g = Gs * sG + Gd * dG; |
b = Bs * sB + Bd * dB; |
a = As * sA + Ad * dA; |
break; |
case GL_FUNC_SUBTRACT: |
r = Rs * sR - Rd * dR; |
g = Gs * sG - Gd * dG; |
b = Bs * sB - Bd * dB; |
a = As * sA - Ad * dA; |
break; |
case GL_FUNC_REVERSE_SUBTRACT: |
r = Rd * dR - Rs * sR; |
g = Gd * dG - Gs * sG; |
b = Bd * dB - Bs * sB; |
a = Ad * dA - As * sA; |
break; |
case GL_MIN: |
r = MIN2( Rd, Rs ); |
g = MIN2( Gd, Gs ); |
b = MIN2( Bd, Bs ); |
break; |
case GL_MAX: |
r = MAX2( Rd, Rs ); |
g = MAX2( Gd, Gs ); |
b = MAX2( Bd, Bs ); |
break; |
default: |
/* should never get here */ |
r = g = b = 0.0F; /* silence uninitialized var warning */ |
_mesa_problem(ctx, "unexpected BlendEquation in blend_general()"); |
return; |
} |
|
/* compute the blended alpha */ |
switch (ctx->Color.Blend[0].EquationA) { |
case GL_FUNC_ADD: |
a = As * sA + Ad * dA; |
break; |
case GL_FUNC_SUBTRACT: |
a = As * sA - Ad * dA; |
break; |
case GL_FUNC_REVERSE_SUBTRACT: |
a = Ad * dA - As * sA; |
break; |
case GL_MIN: |
a = MIN2( Ad, As ); |
break; |
case GL_MAX: |
a = MAX2( Ad, As ); |
break; |
default: |
/* should never get here */ |
a = 0.0F; /* silence uninitialized var warning */ |
_mesa_problem(ctx, "unexpected BlendEquation in blend_general()"); |
return; |
} |
|
/* final clamping */ |
#if 0 |
rgba[i][RCOMP] = MAX2( r, 0.0F ); |
rgba[i][GCOMP] = MAX2( g, 0.0F ); |
rgba[i][BCOMP] = MAX2( b, 0.0F ); |
rgba[i][ACOMP] = CLAMP( a, 0.0F, 1.0F ); |
#else |
ASSIGN_4V(rgba[i], r, g, b, a); |
#endif |
} |
} |
} |
|
|
/** |
* Do any blending operation, any chanType. |
*/ |
static void |
blend_general(struct gl_context *ctx, GLuint n, const GLubyte mask[], |
void *src, const void *dst, GLenum chanType) |
{ |
GLfloat (*rgbaF)[4], (*destF)[4]; |
|
rgbaF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat)); |
destF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat)); |
if (!rgbaF || !destF) { |
free(rgbaF); |
free(destF); |
_mesa_error(ctx, GL_OUT_OF_MEMORY, "blending"); |
return; |
} |
|
if (chanType == GL_UNSIGNED_BYTE) { |
GLubyte (*rgba)[4] = (GLubyte (*)[4]) src; |
const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst; |
GLuint i; |
/* convert ubytes to floats */ |
for (i = 0; i < n; i++) { |
if (mask[i]) { |
rgbaF[i][RCOMP] = UBYTE_TO_FLOAT(rgba[i][RCOMP]); |
rgbaF[i][GCOMP] = UBYTE_TO_FLOAT(rgba[i][GCOMP]); |
rgbaF[i][BCOMP] = UBYTE_TO_FLOAT(rgba[i][BCOMP]); |
rgbaF[i][ACOMP] = UBYTE_TO_FLOAT(rgba[i][ACOMP]); |
destF[i][RCOMP] = UBYTE_TO_FLOAT(dest[i][RCOMP]); |
destF[i][GCOMP] = UBYTE_TO_FLOAT(dest[i][GCOMP]); |
destF[i][BCOMP] = UBYTE_TO_FLOAT(dest[i][BCOMP]); |
destF[i][ACOMP] = UBYTE_TO_FLOAT(dest[i][ACOMP]); |
} |
} |
/* do blend */ |
blend_general_float(ctx, n, mask, rgbaF, destF, chanType); |
/* convert back to ubytes */ |
for (i = 0; i < n; i++) { |
if (mask[i]) |
_mesa_unclamped_float_rgba_to_ubyte(rgba[i], rgbaF[i]); |
} |
} |
else if (chanType == GL_UNSIGNED_SHORT) { |
GLushort (*rgba)[4] = (GLushort (*)[4]) src; |
const GLushort (*dest)[4] = (const GLushort (*)[4]) dst; |
GLuint i; |
/* convert ushorts to floats */ |
for (i = 0; i < n; i++) { |
if (mask[i]) { |
rgbaF[i][RCOMP] = USHORT_TO_FLOAT(rgba[i][RCOMP]); |
rgbaF[i][GCOMP] = USHORT_TO_FLOAT(rgba[i][GCOMP]); |
rgbaF[i][BCOMP] = USHORT_TO_FLOAT(rgba[i][BCOMP]); |
rgbaF[i][ACOMP] = USHORT_TO_FLOAT(rgba[i][ACOMP]); |
destF[i][RCOMP] = USHORT_TO_FLOAT(dest[i][RCOMP]); |
destF[i][GCOMP] = USHORT_TO_FLOAT(dest[i][GCOMP]); |
destF[i][BCOMP] = USHORT_TO_FLOAT(dest[i][BCOMP]); |
destF[i][ACOMP] = USHORT_TO_FLOAT(dest[i][ACOMP]); |
} |
} |
/* do blend */ |
blend_general_float(ctx, n, mask, rgbaF, destF, chanType); |
/* convert back to ushorts */ |
for (i = 0; i < n; i++) { |
if (mask[i]) { |
UNCLAMPED_FLOAT_TO_USHORT(rgba[i][RCOMP], rgbaF[i][RCOMP]); |
UNCLAMPED_FLOAT_TO_USHORT(rgba[i][GCOMP], rgbaF[i][GCOMP]); |
UNCLAMPED_FLOAT_TO_USHORT(rgba[i][BCOMP], rgbaF[i][BCOMP]); |
UNCLAMPED_FLOAT_TO_USHORT(rgba[i][ACOMP], rgbaF[i][ACOMP]); |
} |
} |
} |
else { |
blend_general_float(ctx, n, mask, (GLfloat (*)[4]) src, |
(GLfloat (*)[4]) dst, chanType); |
} |
|
free(rgbaF); |
free(destF); |
} |
|
|
|
/** |
* Analyze current blending parameters to pick fastest blending function. |
* Result: the ctx->Color.BlendFunc pointer is updated. |
*/ |
void |
_swrast_choose_blend_func(struct gl_context *ctx, GLenum chanType) |
{ |
SWcontext *swrast = SWRAST_CONTEXT(ctx); |
const GLenum eq = ctx->Color.Blend[0].EquationRGB; |
const GLenum srcRGB = ctx->Color.Blend[0].SrcRGB; |
const GLenum dstRGB = ctx->Color.Blend[0].DstRGB; |
const GLenum srcA = ctx->Color.Blend[0].SrcA; |
const GLenum dstA = ctx->Color.Blend[0].DstA; |
|
if (ctx->Color.Blend[0].EquationRGB != ctx->Color.Blend[0].EquationA) { |
swrast->BlendFunc = blend_general; |
} |
else if (eq == GL_MIN) { |
/* Note: GL_MIN ignores the blending weight factors */ |
#if defined(USE_MMX_ASM) |
if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) { |
swrast->BlendFunc = _mesa_mmx_blend_min; |
} |
else |
#endif |
swrast->BlendFunc = blend_min; |
} |
else if (eq == GL_MAX) { |
/* Note: GL_MAX ignores the blending weight factors */ |
#if defined(USE_MMX_ASM) |
if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) { |
swrast->BlendFunc = _mesa_mmx_blend_max; |
} |
else |
#endif |
swrast->BlendFunc = blend_max; |
} |
else if (srcRGB != srcA || dstRGB != dstA) { |
swrast->BlendFunc = blend_general; |
} |
else if (eq == GL_FUNC_ADD && srcRGB == GL_SRC_ALPHA |
&& dstRGB == GL_ONE_MINUS_SRC_ALPHA) { |
#if defined(USE_MMX_ASM) |
if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) { |
swrast->BlendFunc = _mesa_mmx_blend_transparency; |
} |
else |
#endif |
{ |
if (chanType == GL_UNSIGNED_BYTE) |
swrast->BlendFunc = blend_transparency_ubyte; |
else if (chanType == GL_UNSIGNED_SHORT) |
swrast->BlendFunc = blend_transparency_ushort; |
else |
swrast->BlendFunc = blend_transparency_float; |
} |
} |
else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ONE) { |
#if defined(USE_MMX_ASM) |
if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) { |
swrast->BlendFunc = _mesa_mmx_blend_add; |
} |
else |
#endif |
swrast->BlendFunc = blend_add; |
} |
else if (((eq == GL_FUNC_ADD || eq == GL_FUNC_REVERSE_SUBTRACT) |
&& (srcRGB == GL_ZERO && dstRGB == GL_SRC_COLOR)) |
|| |
((eq == GL_FUNC_ADD || eq == GL_FUNC_SUBTRACT) |
&& (srcRGB == GL_DST_COLOR && dstRGB == GL_ZERO))) { |
#if defined(USE_MMX_ASM) |
if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) { |
swrast->BlendFunc = _mesa_mmx_blend_modulate; |
} |
else |
#endif |
swrast->BlendFunc = blend_modulate; |
} |
else if (eq == GL_FUNC_ADD && srcRGB == GL_ZERO && dstRGB == GL_ONE) { |
swrast->BlendFunc = blend_noop; |
} |
else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ZERO) { |
swrast->BlendFunc = blend_replace; |
} |
else { |
swrast->BlendFunc = blend_general; |
} |
} |
|
|
|
/** |
* Apply the blending operator to a span of pixels. |
* We can handle horizontal runs of pixels (spans) or arrays of x/y |
* pixel coordinates. |
*/ |
void |
_swrast_blend_span(struct gl_context *ctx, struct gl_renderbuffer *rb, SWspan *span) |
{ |
SWcontext *swrast = SWRAST_CONTEXT(ctx); |
void *rbPixels; |
|
assert(span->end <= SWRAST_MAX_WIDTH); |
assert(span->arrayMask & SPAN_RGBA); |
assert(!ctx->Color.ColorLogicOpEnabled); |
|
rbPixels = _swrast_get_dest_rgba(ctx, rb, span); |
|
swrast->BlendFunc(ctx, span->end, span->array->mask, |
span->array->rgba, rbPixels, span->array->ChanType); |
} |