/**************************************************************************
*
* 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;
}
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;
}
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);
}
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);
}
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);
}
}