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/************************************************************************** |
* |
* Copyright 2003 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 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 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/glheader.h" |
#include "main/macros.h" |
#include "main/mtypes.h" |
#include "main/simple_list.h" |
#include "main/enums.h" |
#include "main/mm.h" |
|
#include "intel_screen.h" |
#include "intel_tex.h" |
|
#include "i830_context.h" |
#include "i830_reg.h" |
|
|
/* ================================================================ |
* Texture combine functions |
*/ |
static GLuint |
pass_through(GLuint * state, GLuint blendUnit) |
{ |
state[0] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) | |
TEXPIPE_COLOR | |
ENABLE_TEXOUTPUT_WRT_SEL | |
TEXOP_OUTPUT_CURRENT | |
DISABLE_TEX_CNTRL_STAGE | |
TEXOP_SCALE_1X | TEXOP_MODIFY_PARMS | TEXBLENDOP_ARG1); |
state[1] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) | |
TEXPIPE_ALPHA | |
ENABLE_TEXOUTPUT_WRT_SEL | |
TEXOP_OUTPUT_CURRENT | |
TEXOP_SCALE_1X | TEXOP_MODIFY_PARMS | TEXBLENDOP_ARG1); |
state[2] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) | |
TEXPIPE_COLOR | |
TEXBLEND_ARG1 | |
TEXBLENDARG_MODIFY_PARMS | TEXBLENDARG_CURRENT); |
state[3] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) | |
TEXPIPE_ALPHA | |
TEXBLEND_ARG1 | |
TEXBLENDARG_MODIFY_PARMS | TEXBLENDARG_CURRENT); |
|
return 4; |
} |
|
static GLuint |
emit_factor(GLuint blendUnit, GLuint * state, GLuint count, |
const GLfloat * factor) |
{ |
GLubyte r, g, b, a; |
GLuint col; |
|
if (0) |
fprintf(stderr, "emit constant %d: %.2f %.2f %.2f %.2f\n", |
blendUnit, factor[0], factor[1], factor[2], factor[3]); |
|
UNCLAMPED_FLOAT_TO_UBYTE(r, factor[0]); |
UNCLAMPED_FLOAT_TO_UBYTE(g, factor[1]); |
UNCLAMPED_FLOAT_TO_UBYTE(b, factor[2]); |
UNCLAMPED_FLOAT_TO_UBYTE(a, factor[3]); |
|
col = ((a << 24) | (r << 16) | (g << 8) | b); |
|
state[count++] = _3DSTATE_COLOR_FACTOR_N_CMD(blendUnit); |
state[count++] = col; |
|
return count; |
} |
|
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static INLINE GLuint |
GetTexelOp(GLint unit) |
{ |
switch (unit) { |
case 0: |
return TEXBLENDARG_TEXEL0; |
case 1: |
return TEXBLENDARG_TEXEL1; |
case 2: |
return TEXBLENDARG_TEXEL2; |
case 3: |
return TEXBLENDARG_TEXEL3; |
default: |
return TEXBLENDARG_TEXEL0; |
} |
} |
|
|
/** |
* Calculate the hardware instuctions to setup the current texture enviromnemt |
* settings. Since \c gl_texture_unit::_CurrentCombine is used, both |
* "classic" texture enviroments and GL_ARB_texture_env_combine type texture |
* environments are treated identically. |
* |
* \todo |
* This function should return \c bool. When \c false is returned, |
* it means that an environment is selected that the hardware cannot do. This |
* is the way the Radeon and R200 drivers work. |
* |
* \todo |
* Looking at i830_3d_regs.h, it seems the i830 can do part of |
* GL_ATI_texture_env_combine3. It can handle using \c GL_ONE and |
* \c GL_ZERO as combine inputs (which the code already supports). It can |
* also handle the \c GL_MODULATE_ADD_ATI mode. Is it worth investigating |
* partial support for the extension? |
*/ |
GLuint |
i830SetTexEnvCombine(struct i830_context * i830, |
const struct gl_tex_env_combine_state * combine, |
GLint blendUnit, |
GLuint texel_op, GLuint * state, const GLfloat * factor) |
{ |
const GLuint numColorArgs = combine->_NumArgsRGB; |
const GLuint numAlphaArgs = combine->_NumArgsA; |
|
GLuint blendop; |
GLuint ablendop; |
GLuint args_RGB[3]; |
GLuint args_A[3]; |
GLuint rgb_shift; |
GLuint alpha_shift; |
bool need_factor = 0; |
int i; |
unsigned used; |
static const GLuint tex_blend_rgb[3] = { |
TEXPIPE_COLOR | TEXBLEND_ARG1 | TEXBLENDARG_MODIFY_PARMS, |
TEXPIPE_COLOR | TEXBLEND_ARG2 | TEXBLENDARG_MODIFY_PARMS, |
TEXPIPE_COLOR | TEXBLEND_ARG0 | TEXBLENDARG_MODIFY_PARMS, |
}; |
static const GLuint tex_blend_a[3] = { |
TEXPIPE_ALPHA | TEXBLEND_ARG1 | TEXBLENDARG_MODIFY_PARMS, |
TEXPIPE_ALPHA | TEXBLEND_ARG2 | TEXBLENDARG_MODIFY_PARMS, |
TEXPIPE_ALPHA | TEXBLEND_ARG0 | TEXBLENDARG_MODIFY_PARMS, |
}; |
|
if (INTEL_DEBUG & DEBUG_TEXTURE) |
fprintf(stderr, "%s\n", __FUNCTION__); |
|
|
/* The EXT version of the DOT3 extension does not support the |
* scale factor, but the ARB version (and the version in OpenGL |
* 1.3) does. |
*/ |
switch (combine->ModeRGB) { |
case GL_DOT3_RGB_EXT: |
alpha_shift = combine->ScaleShiftA; |
rgb_shift = 0; |
break; |
|
case GL_DOT3_RGBA_EXT: |
alpha_shift = 0; |
rgb_shift = 0; |
break; |
|
default: |
rgb_shift = combine->ScaleShiftRGB; |
alpha_shift = combine->ScaleShiftA; |
break; |
} |
|
|
switch (combine->ModeRGB) { |
case GL_REPLACE: |
blendop = TEXBLENDOP_ARG1; |
break; |
case GL_MODULATE: |
blendop = TEXBLENDOP_MODULATE; |
break; |
case GL_ADD: |
blendop = TEXBLENDOP_ADD; |
break; |
case GL_ADD_SIGNED: |
blendop = TEXBLENDOP_ADDSIGNED; |
break; |
case GL_INTERPOLATE: |
blendop = TEXBLENDOP_BLEND; |
break; |
case GL_SUBTRACT: |
blendop = TEXBLENDOP_SUBTRACT; |
break; |
case GL_DOT3_RGB_EXT: |
case GL_DOT3_RGB: |
blendop = TEXBLENDOP_DOT3; |
break; |
case GL_DOT3_RGBA_EXT: |
case GL_DOT3_RGBA: |
blendop = TEXBLENDOP_DOT3; |
break; |
default: |
return pass_through(state, blendUnit); |
} |
|
blendop |= (rgb_shift << TEXOP_SCALE_SHIFT); |
|
|
/* Handle RGB args */ |
for (i = 0; i < 3; i++) { |
switch (combine->SourceRGB[i]) { |
case GL_TEXTURE: |
args_RGB[i] = texel_op; |
break; |
case GL_TEXTURE0: |
case GL_TEXTURE1: |
case GL_TEXTURE2: |
case GL_TEXTURE3: |
args_RGB[i] = GetTexelOp(combine->SourceRGB[i] - GL_TEXTURE0); |
break; |
case GL_CONSTANT: |
args_RGB[i] = TEXBLENDARG_FACTOR_N; |
need_factor = 1; |
break; |
case GL_PRIMARY_COLOR: |
args_RGB[i] = TEXBLENDARG_DIFFUSE; |
break; |
case GL_PREVIOUS: |
args_RGB[i] = TEXBLENDARG_CURRENT; |
break; |
default: |
return pass_through(state, blendUnit); |
} |
|
switch (combine->OperandRGB[i]) { |
case GL_SRC_COLOR: |
args_RGB[i] |= 0; |
break; |
case GL_ONE_MINUS_SRC_COLOR: |
args_RGB[i] |= TEXBLENDARG_INV_ARG; |
break; |
case GL_SRC_ALPHA: |
args_RGB[i] |= TEXBLENDARG_REPLICATE_ALPHA; |
break; |
case GL_ONE_MINUS_SRC_ALPHA: |
args_RGB[i] |= (TEXBLENDARG_REPLICATE_ALPHA | TEXBLENDARG_INV_ARG); |
break; |
default: |
return pass_through(state, blendUnit); |
} |
} |
|
|
/* Need to knobble the alpha calculations of TEXBLENDOP_DOT4 to |
* match the spec. Can't use DOT3 as it won't propogate values |
* into alpha as required: |
* |
* Note - the global factor is set up with alpha == .5, so |
* the alpha part of the DOT4 calculation should be zero. |
*/ |
if (combine->ModeRGB == GL_DOT3_RGBA_EXT || |
combine->ModeRGB == GL_DOT3_RGBA) { |
ablendop = TEXBLENDOP_DOT4; |
args_A[0] = TEXBLENDARG_FACTOR; /* the global factor */ |
args_A[1] = TEXBLENDARG_FACTOR; |
args_A[2] = TEXBLENDARG_FACTOR; |
} |
else { |
switch (combine->ModeA) { |
case GL_REPLACE: |
ablendop = TEXBLENDOP_ARG1; |
break; |
case GL_MODULATE: |
ablendop = TEXBLENDOP_MODULATE; |
break; |
case GL_ADD: |
ablendop = TEXBLENDOP_ADD; |
break; |
case GL_ADD_SIGNED: |
ablendop = TEXBLENDOP_ADDSIGNED; |
break; |
case GL_INTERPOLATE: |
ablendop = TEXBLENDOP_BLEND; |
break; |
case GL_SUBTRACT: |
ablendop = TEXBLENDOP_SUBTRACT; |
break; |
default: |
return pass_through(state, blendUnit); |
} |
|
|
ablendop |= (alpha_shift << TEXOP_SCALE_SHIFT); |
|
/* Handle A args */ |
for (i = 0; i < 3; i++) { |
switch (combine->SourceA[i]) { |
case GL_TEXTURE: |
args_A[i] = texel_op; |
break; |
case GL_TEXTURE0: |
case GL_TEXTURE1: |
case GL_TEXTURE2: |
case GL_TEXTURE3: |
args_A[i] = GetTexelOp(combine->SourceA[i] - GL_TEXTURE0); |
break; |
case GL_CONSTANT: |
args_A[i] = TEXBLENDARG_FACTOR_N; |
need_factor = 1; |
break; |
case GL_PRIMARY_COLOR: |
args_A[i] = TEXBLENDARG_DIFFUSE; |
break; |
case GL_PREVIOUS: |
args_A[i] = TEXBLENDARG_CURRENT; |
break; |
default: |
return pass_through(state, blendUnit); |
} |
|
switch (combine->OperandA[i]) { |
case GL_SRC_ALPHA: |
args_A[i] |= 0; |
break; |
case GL_ONE_MINUS_SRC_ALPHA: |
args_A[i] |= TEXBLENDARG_INV_ARG; |
break; |
default: |
return pass_through(state, blendUnit); |
} |
} |
} |
|
|
|
/* Native Arg1 == Arg0 in GL_EXT_texture_env_combine spec */ |
/* Native Arg2 == Arg1 in GL_EXT_texture_env_combine spec */ |
/* Native Arg0 == Arg2 in GL_EXT_texture_env_combine spec */ |
|
/* When we render we need to figure out which is the last really enabled |
* tex unit, and put last stage on it |
*/ |
|
|
/* Build color & alpha pipelines */ |
|
used = 0; |
state[used++] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) | |
TEXPIPE_COLOR | |
ENABLE_TEXOUTPUT_WRT_SEL | |
TEXOP_OUTPUT_CURRENT | |
DISABLE_TEX_CNTRL_STAGE | TEXOP_MODIFY_PARMS | blendop); |
state[used++] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) | |
TEXPIPE_ALPHA | |
ENABLE_TEXOUTPUT_WRT_SEL | |
TEXOP_OUTPUT_CURRENT | TEXOP_MODIFY_PARMS | ablendop); |
|
for (i = 0; i < numColorArgs; i++) { |
state[used++] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) | |
tex_blend_rgb[i] | args_RGB[i]); |
} |
|
for (i = 0; i < numAlphaArgs; i++) { |
state[used++] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) | |
tex_blend_a[i] | args_A[i]); |
} |
|
|
if (need_factor) |
return emit_factor(blendUnit, state, used, factor); |
else |
return used; |
} |
|
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static void |
emit_texblend(struct i830_context *i830, GLuint unit, GLuint blendUnit, |
bool last_stage) |
{ |
struct gl_texture_unit *texUnit = &i830->intel.ctx.Texture.Unit[unit]; |
GLuint tmp[I830_TEXBLEND_SIZE], tmp_sz; |
|
|
if (0) |
fprintf(stderr, "%s unit %d\n", __FUNCTION__, unit); |
|
/* Update i830->state.TexBlend |
*/ |
tmp_sz = i830SetTexEnvCombine(i830, texUnit->_CurrentCombine, blendUnit, |
GetTexelOp(unit), tmp, texUnit->EnvColor); |
|
if (last_stage) |
tmp[0] |= TEXOP_LAST_STAGE; |
|
if (tmp_sz != i830->state.TexBlendWordsUsed[blendUnit] || |
memcmp(tmp, i830->state.TexBlend[blendUnit], |
tmp_sz * sizeof(GLuint))) { |
|
I830_STATECHANGE(i830, I830_UPLOAD_TEXBLEND(blendUnit)); |
memcpy(i830->state.TexBlend[blendUnit], tmp, tmp_sz * sizeof(GLuint)); |
i830->state.TexBlendWordsUsed[blendUnit] = tmp_sz; |
} |
|
I830_ACTIVESTATE(i830, I830_UPLOAD_TEXBLEND(blendUnit), true); |
} |
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static void |
emit_passthrough(struct i830_context *i830) |
{ |
GLuint tmp[I830_TEXBLEND_SIZE], tmp_sz; |
GLuint unit = 0; |
|
tmp_sz = pass_through(tmp, unit); |
tmp[0] |= TEXOP_LAST_STAGE; |
|
if (tmp_sz != i830->state.TexBlendWordsUsed[unit] || |
memcmp(tmp, i830->state.TexBlend[unit], tmp_sz * sizeof(GLuint))) { |
|
I830_STATECHANGE(i830, I830_UPLOAD_TEXBLEND(unit)); |
memcpy(i830->state.TexBlend[unit], tmp, tmp_sz * sizeof(GLuint)); |
i830->state.TexBlendWordsUsed[unit] = tmp_sz; |
} |
|
I830_ACTIVESTATE(i830, I830_UPLOAD_TEXBLEND(unit), true); |
} |
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void |
i830EmitTextureBlend(struct i830_context *i830) |
{ |
struct gl_context *ctx = &i830->intel.ctx; |
GLuint unit, last_stage = 0, blendunit = 0; |
|
I830_ACTIVESTATE(i830, I830_UPLOAD_TEXBLEND_ALL, false); |
|
if (ctx->Texture._EnabledUnits) { |
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) |
if (ctx->Texture.Unit[unit]._ReallyEnabled) |
last_stage = unit; |
|
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) |
if (ctx->Texture.Unit[unit]._ReallyEnabled) |
emit_texblend(i830, unit, blendunit++, last_stage == unit); |
} |
else { |
emit_passthrough(i830); |
} |
} |