1 /**************************************************************************
3 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 #include "main/glheader.h"
29 #include "main/macros.h"
30 #include "main/mtypes.h"
31 #include "main/simple_list.h"
32 #include "main/enums.h"
33 #include "main/texstore.h"
36 #include "intel_screen.h"
37 #include "intel_tex.h"
39 #include "i830_context.h"
43 /* ================================================================
44 * Texture combine functions
47 pass_through(GLuint
* state
, GLuint blendUnit
)
49 state
[0] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit
) |
51 ENABLE_TEXOUTPUT_WRT_SEL
|
52 TEXOP_OUTPUT_CURRENT
|
53 DISABLE_TEX_CNTRL_STAGE
|
54 TEXOP_SCALE_1X
| TEXOP_MODIFY_PARMS
| TEXBLENDOP_ARG1
);
55 state
[1] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit
) |
57 ENABLE_TEXOUTPUT_WRT_SEL
|
58 TEXOP_OUTPUT_CURRENT
|
59 TEXOP_SCALE_1X
| TEXOP_MODIFY_PARMS
| TEXBLENDOP_ARG1
);
60 state
[2] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit
) |
63 TEXBLENDARG_MODIFY_PARMS
| TEXBLENDARG_CURRENT
);
64 state
[3] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit
) |
67 TEXBLENDARG_MODIFY_PARMS
| TEXBLENDARG_CURRENT
);
73 emit_factor(GLuint blendUnit
, GLuint
* state
, GLuint count
,
74 const GLfloat
* factor
)
80 fprintf(stderr
, "emit constant %d: %.2f %.2f %.2f %.2f\n",
81 blendUnit
, factor
[0], factor
[1], factor
[2], factor
[3]);
83 UNCLAMPED_FLOAT_TO_UBYTE(r
, factor
[0]);
84 UNCLAMPED_FLOAT_TO_UBYTE(g
, factor
[1]);
85 UNCLAMPED_FLOAT_TO_UBYTE(b
, factor
[2]);
86 UNCLAMPED_FLOAT_TO_UBYTE(a
, factor
[3]);
88 col
= ((a
<< 24) | (r
<< 16) | (g
<< 8) | b
);
90 state
[count
++] = _3DSTATE_COLOR_FACTOR_N_CMD(blendUnit
);
98 GetTexelOp(GLint unit
)
102 return TEXBLENDARG_TEXEL0
;
104 return TEXBLENDARG_TEXEL1
;
106 return TEXBLENDARG_TEXEL2
;
108 return TEXBLENDARG_TEXEL3
;
110 return TEXBLENDARG_TEXEL0
;
116 * Calculate the hardware instuctions to setup the current texture enviromnemt
117 * settings. Since \c gl_texture_unit::_CurrentCombine is used, both
118 * "classic" texture enviroments and GL_ARB_texture_env_combine type texture
119 * environments are treated identically.
122 * This function should return \c GLboolean. When \c GL_FALSE is returned,
123 * it means that an environment is selected that the hardware cannot do. This
124 * is the way the Radeon and R200 drivers work.
127 * Looking at i830_3d_regs.h, it seems the i830 can do part of
128 * GL_ATI_texture_env_combine3. It can handle using \c GL_ONE and
129 * \c GL_ZERO as combine inputs (which the code already supports). It can
130 * also handle the \c GL_MODULATE_ADD_ATI mode. Is it worth investigating
131 * partial support for the extension?
134 i830SetTexEnvCombine(struct i830_context
* i830
,
135 const struct gl_tex_env_combine_state
* combine
,
137 GLuint texel_op
, GLuint
* state
, const GLfloat
* factor
)
139 const GLuint numColorArgs
= combine
->_NumArgsRGB
;
140 const GLuint numAlphaArgs
= combine
->_NumArgsA
;
148 GLboolean need_factor
= 0;
151 static const GLuint tex_blend_rgb
[3] = {
152 TEXPIPE_COLOR
| TEXBLEND_ARG1
| TEXBLENDARG_MODIFY_PARMS
,
153 TEXPIPE_COLOR
| TEXBLEND_ARG2
| TEXBLENDARG_MODIFY_PARMS
,
154 TEXPIPE_COLOR
| TEXBLEND_ARG0
| TEXBLENDARG_MODIFY_PARMS
,
156 static const GLuint tex_blend_a
[3] = {
157 TEXPIPE_ALPHA
| TEXBLEND_ARG1
| TEXBLENDARG_MODIFY_PARMS
,
158 TEXPIPE_ALPHA
| TEXBLEND_ARG2
| TEXBLENDARG_MODIFY_PARMS
,
159 TEXPIPE_ALPHA
| TEXBLEND_ARG0
| TEXBLENDARG_MODIFY_PARMS
,
162 if (INTEL_DEBUG
& DEBUG_TEXTURE
)
163 fprintf(stderr
, "%s\n", __FUNCTION__
);
166 /* The EXT version of the DOT3 extension does not support the
167 * scale factor, but the ARB version (and the version in OpenGL
170 switch (combine
->ModeRGB
) {
171 case GL_DOT3_RGB_EXT
:
172 alpha_shift
= combine
->ScaleShiftA
;
176 case GL_DOT3_RGBA_EXT
:
182 rgb_shift
= combine
->ScaleShiftRGB
;
183 alpha_shift
= combine
->ScaleShiftA
;
188 switch (combine
->ModeRGB
) {
190 blendop
= TEXBLENDOP_ARG1
;
193 blendop
= TEXBLENDOP_MODULATE
;
196 blendop
= TEXBLENDOP_ADD
;
199 blendop
= TEXBLENDOP_ADDSIGNED
;
202 blendop
= TEXBLENDOP_BLEND
;
205 blendop
= TEXBLENDOP_SUBTRACT
;
207 case GL_DOT3_RGB_EXT
:
209 blendop
= TEXBLENDOP_DOT3
;
211 case GL_DOT3_RGBA_EXT
:
213 blendop
= TEXBLENDOP_DOT3
;
216 return pass_through(state
, blendUnit
);
219 blendop
|= (rgb_shift
<< TEXOP_SCALE_SHIFT
);
222 /* Handle RGB args */
223 for (i
= 0; i
< 3; i
++) {
224 switch (combine
->SourceRGB
[i
]) {
226 args_RGB
[i
] = texel_op
;
232 args_RGB
[i
] = GetTexelOp(combine
->SourceRGB
[i
] - GL_TEXTURE0
);
235 args_RGB
[i
] = TEXBLENDARG_FACTOR_N
;
238 case GL_PRIMARY_COLOR
:
239 args_RGB
[i
] = TEXBLENDARG_DIFFUSE
;
242 args_RGB
[i
] = TEXBLENDARG_CURRENT
;
245 return pass_through(state
, blendUnit
);
248 switch (combine
->OperandRGB
[i
]) {
252 case GL_ONE_MINUS_SRC_COLOR
:
253 args_RGB
[i
] |= TEXBLENDARG_INV_ARG
;
256 args_RGB
[i
] |= TEXBLENDARG_REPLICATE_ALPHA
;
258 case GL_ONE_MINUS_SRC_ALPHA
:
259 args_RGB
[i
] |= (TEXBLENDARG_REPLICATE_ALPHA
| TEXBLENDARG_INV_ARG
);
262 return pass_through(state
, blendUnit
);
267 /* Need to knobble the alpha calculations of TEXBLENDOP_DOT4 to
268 * match the spec. Can't use DOT3 as it won't propogate values
269 * into alpha as required:
271 * Note - the global factor is set up with alpha == .5, so
272 * the alpha part of the DOT4 calculation should be zero.
274 if (combine
->ModeRGB
== GL_DOT3_RGBA_EXT
||
275 combine
->ModeRGB
== GL_DOT3_RGBA
) {
276 ablendop
= TEXBLENDOP_DOT4
;
277 args_A
[0] = TEXBLENDARG_FACTOR
; /* the global factor */
278 args_A
[1] = TEXBLENDARG_FACTOR
;
279 args_A
[2] = TEXBLENDARG_FACTOR
;
282 switch (combine
->ModeA
) {
284 ablendop
= TEXBLENDOP_ARG1
;
287 ablendop
= TEXBLENDOP_MODULATE
;
290 ablendop
= TEXBLENDOP_ADD
;
293 ablendop
= TEXBLENDOP_ADDSIGNED
;
296 ablendop
= TEXBLENDOP_BLEND
;
299 ablendop
= TEXBLENDOP_SUBTRACT
;
302 return pass_through(state
, blendUnit
);
306 ablendop
|= (alpha_shift
<< TEXOP_SCALE_SHIFT
);
309 for (i
= 0; i
< 3; i
++) {
310 switch (combine
->SourceA
[i
]) {
312 args_A
[i
] = texel_op
;
318 args_A
[i
] = GetTexelOp(combine
->SourceA
[i
] - GL_TEXTURE0
);
321 args_A
[i
] = TEXBLENDARG_FACTOR_N
;
324 case GL_PRIMARY_COLOR
:
325 args_A
[i
] = TEXBLENDARG_DIFFUSE
;
328 args_A
[i
] = TEXBLENDARG_CURRENT
;
331 return pass_through(state
, blendUnit
);
334 switch (combine
->OperandA
[i
]) {
338 case GL_ONE_MINUS_SRC_ALPHA
:
339 args_A
[i
] |= TEXBLENDARG_INV_ARG
;
342 return pass_through(state
, blendUnit
);
349 /* Native Arg1 == Arg0 in GL_EXT_texture_env_combine spec */
350 /* Native Arg2 == Arg1 in GL_EXT_texture_env_combine spec */
351 /* Native Arg0 == Arg2 in GL_EXT_texture_env_combine spec */
353 /* When we render we need to figure out which is the last really enabled
354 * tex unit, and put last stage on it
358 /* Build color & alpha pipelines */
361 state
[used
++] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit
) |
363 ENABLE_TEXOUTPUT_WRT_SEL
|
364 TEXOP_OUTPUT_CURRENT
|
365 DISABLE_TEX_CNTRL_STAGE
| TEXOP_MODIFY_PARMS
| blendop
);
366 state
[used
++] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit
) |
368 ENABLE_TEXOUTPUT_WRT_SEL
|
369 TEXOP_OUTPUT_CURRENT
| TEXOP_MODIFY_PARMS
| ablendop
);
371 for (i
= 0; i
< numColorArgs
; i
++) {
372 state
[used
++] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit
) |
373 tex_blend_rgb
[i
] | args_RGB
[i
]);
376 for (i
= 0; i
< numAlphaArgs
; i
++) {
377 state
[used
++] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit
) |
378 tex_blend_a
[i
] | args_A
[i
]);
383 return emit_factor(blendUnit
, state
, used
, factor
);
390 emit_texblend(struct i830_context
*i830
, GLuint unit
, GLuint blendUnit
,
391 GLboolean last_stage
)
393 struct gl_texture_unit
*texUnit
= &i830
->intel
.ctx
.Texture
.Unit
[unit
];
394 GLuint tmp
[I830_TEXBLEND_SIZE
], tmp_sz
;
398 fprintf(stderr
, "%s unit %d\n", __FUNCTION__
, unit
);
400 /* Update i830->state.TexBlend
402 tmp_sz
= i830SetTexEnvCombine(i830
, texUnit
->_CurrentCombine
, blendUnit
,
403 GetTexelOp(unit
), tmp
, texUnit
->EnvColor
);
406 tmp
[0] |= TEXOP_LAST_STAGE
;
408 if (tmp_sz
!= i830
->state
.TexBlendWordsUsed
[blendUnit
] ||
409 memcmp(tmp
, i830
->state
.TexBlend
[blendUnit
],
410 tmp_sz
* sizeof(GLuint
))) {
412 I830_STATECHANGE(i830
, I830_UPLOAD_TEXBLEND(blendUnit
));
413 memcpy(i830
->state
.TexBlend
[blendUnit
], tmp
, tmp_sz
* sizeof(GLuint
));
414 i830
->state
.TexBlendWordsUsed
[blendUnit
] = tmp_sz
;
417 I830_ACTIVESTATE(i830
, I830_UPLOAD_TEXBLEND(blendUnit
), GL_TRUE
);
421 emit_passthrough(struct i830_context
*i830
)
423 GLuint tmp
[I830_TEXBLEND_SIZE
], tmp_sz
;
426 tmp_sz
= pass_through(tmp
, unit
);
427 tmp
[0] |= TEXOP_LAST_STAGE
;
429 if (tmp_sz
!= i830
->state
.TexBlendWordsUsed
[unit
] ||
430 memcmp(tmp
, i830
->state
.TexBlend
[unit
], tmp_sz
* sizeof(GLuint
))) {
432 I830_STATECHANGE(i830
, I830_UPLOAD_TEXBLEND(unit
));
433 memcpy(i830
->state
.TexBlend
[unit
], tmp
, tmp_sz
* sizeof(GLuint
));
434 i830
->state
.TexBlendWordsUsed
[unit
] = tmp_sz
;
437 I830_ACTIVESTATE(i830
, I830_UPLOAD_TEXBLEND(unit
), GL_TRUE
);
441 i830EmitTextureBlend(struct i830_context
*i830
)
443 struct gl_context
*ctx
= &i830
->intel
.ctx
;
444 GLuint unit
, last_stage
= 0, blendunit
= 0;
446 I830_ACTIVESTATE(i830
, I830_UPLOAD_TEXBLEND_ALL
, GL_FALSE
);
448 if (ctx
->Texture
._EnabledUnits
) {
449 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++)
450 if (ctx
->Texture
.Unit
[unit
]._ReallyEnabled
)
453 for (unit
= 0; unit
< ctx
->Const
.MaxTextureUnits
; unit
++)
454 if (ctx
->Texture
.Unit
[unit
]._ReallyEnabled
)
455 emit_texblend(i830
, unit
, blendunit
++, last_stage
== unit
);
458 emit_passthrough(i830
);