2
* Mesa 3-D graphics library
4
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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#include "math/m_matrix.h"
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#include "util/bitscan.h"
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#include "api_exec_decl.h"
40
_mesa_ShadeModel( GLenum mode )
42
GET_CURRENT_CONTEXT(ctx);
44
if (MESA_VERBOSE & VERBOSE_API)
45
_mesa_debug(ctx, "glShadeModel %s\n", _mesa_enum_to_string(mode));
47
if (ctx->Light.ShadeModel == mode)
50
if (mode != GL_FLAT && mode != GL_SMOOTH) {
51
_mesa_error(ctx, GL_INVALID_ENUM, "glShadeModel");
55
FLUSH_VERTICES(ctx, _NEW_LIGHT_STATE, GL_LIGHTING_BIT);
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ctx->Light.ShadeModel = mode;
61
* Set the provoking vertex (the vertex which specifies the prim's
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* color when flat shading) to either the first or last vertex of the
66
_mesa_ProvokingVertex(GLenum mode)
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GET_CURRENT_CONTEXT(ctx);
70
if (MESA_VERBOSE&VERBOSE_API)
71
_mesa_debug(ctx, "glProvokingVertexEXT 0x%x\n", mode);
73
if (ctx->Light.ProvokingVertex == mode)
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case GL_FIRST_VERTEX_CONVENTION_EXT:
78
case GL_LAST_VERTEX_CONVENTION_EXT:
81
_mesa_error(ctx, GL_INVALID_ENUM, "glProvokingVertexEXT(0x%x)", mode);
85
FLUSH_VERTICES(ctx, _NEW_LIGHT_STATE, GL_LIGHTING_BIT);
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ctx->Light.ProvokingVertex = mode;
91
* Helper function called by _mesa_Lightfv and _mesa_PopAttrib to set
93
* For GL_POSITION and GL_SPOT_DIRECTION the params position/direction
94
* will have already been transformed by the modelview matrix!
95
* Also, all error checking should have already been done.
98
do_light(struct gl_context *ctx, GLuint lnum, GLenum pname, const GLfloat *params)
100
struct gl_light *light;
102
assert(lnum < MAX_LIGHTS);
103
light = &ctx->Light.Light[lnum];
105
struct gl_light_uniforms *lu = &ctx->Light.LightSource[lnum];
109
if (TEST_EQ_4V(lu->Ambient, params))
111
FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
112
COPY_4V( lu->Ambient, params );
115
if (TEST_EQ_4V(lu->Diffuse, params))
117
FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
118
COPY_4V( lu->Diffuse, params );
121
if (TEST_EQ_4V(lu->Specular, params))
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FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
124
COPY_4V( lu->Specular, params );
127
/* NOTE: position has already been transformed by ModelView! */
128
if (TEST_EQ_4V(lu->EyePosition, params))
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FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
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bool old_positional = lu->EyePosition[3] != 0.0f;
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bool positional = params[3] != 0.0f;
134
COPY_4V(lu->EyePosition, params);
136
if (positional != old_positional) {
138
light->_Flags |= LIGHT_POSITIONAL;
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light->_Flags &= ~LIGHT_POSITIONAL;
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/* Used by fixed-func vertex program. */
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ctx->NewState |= _NEW_FF_VERT_PROGRAM;
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static const GLfloat eye_z[] = {0, 0, 1};
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/* Compute infinite half angle vector:
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* halfVector = normalize(normalize(lightPos) + (0, 0, 1))
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* light.EyePosition.w should be 0 for infinite lights.
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COPY_3V(lu->_HalfVector, p);
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lu->_HalfVector[3] = 1.0;
160
case GL_SPOT_DIRECTION:
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/* NOTE: Direction already transformed by inverse ModelView! */
162
if (TEST_EQ_3V(lu->SpotDirection, params))
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FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
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COPY_3V(lu->SpotDirection, params);
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case GL_SPOT_EXPONENT:
168
assert(params[0] >= 0.0F);
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assert(params[0] <= ctx->Const.MaxSpotExponent);
170
if (lu->SpotExponent == params[0])
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FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
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lu->SpotExponent = params[0];
175
case GL_SPOT_CUTOFF: {
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assert(params[0] == 180.0F || (params[0] >= 0.0F && params[0] <= 90.0F));
177
if (lu->SpotCutoff == params[0])
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FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
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bool old_is_180 = lu->SpotCutoff == 180.0f;
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bool is_180 = params[0] == 180.0f;
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lu->SpotCutoff = params[0];
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lu->_CosCutoff = (cosf(lu->SpotCutoff * M_PI / 180.0));
185
if (lu->_CosCutoff < 0)
188
if (is_180 != old_is_180) {
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light->_Flags |= LIGHT_SPOT;
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light->_Flags &= ~LIGHT_SPOT;
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/* Used by fixed-func vertex program. */
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ctx->NewState |= _NEW_FF_VERT_PROGRAM;
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case GL_CONSTANT_ATTENUATION: {
200
assert(params[0] >= 0.0F);
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if (lu->ConstantAttenuation == params[0])
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FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
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bool old_is_one = lu->ConstantAttenuation == 1.0f;
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bool is_one = params[0] == 1.0f;
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lu->ConstantAttenuation = params[0];
209
if (old_is_one != is_one) {
210
/* Used by fixed-func vertex program. */
211
ctx->NewState |= _NEW_FF_VERT_PROGRAM;
215
case GL_LINEAR_ATTENUATION: {
216
assert(params[0] >= 0.0F);
217
if (lu->LinearAttenuation == params[0])
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FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
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bool old_is_zero = lu->LinearAttenuation == 0.0f;
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bool is_zero = params[0] == 0.0f;
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lu->LinearAttenuation = params[0];
225
if (old_is_zero != is_zero) {
226
/* Used by fixed-func vertex program. */
227
ctx->NewState |= _NEW_FF_VERT_PROGRAM;
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case GL_QUADRATIC_ATTENUATION: {
232
assert(params[0] >= 0.0F);
233
if (lu->QuadraticAttenuation == params[0])
235
FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
237
bool old_is_zero = lu->QuadraticAttenuation == 0.0f;
238
bool is_zero = params[0] == 0.0f;
239
lu->QuadraticAttenuation = params[0];
241
if (old_is_zero != is_zero) {
242
/* Used by fixed-func vertex program. */
243
ctx->NewState |= _NEW_FF_VERT_PROGRAM;
248
unreachable("Unexpected pname in do_light()");
254
_mesa_Lightf( GLenum light, GLenum pname, GLfloat param )
258
fparam[1] = fparam[2] = fparam[3] = 0.0F;
259
_mesa_Lightfv( light, pname, fparam );
264
_mesa_Lightfv( GLenum light, GLenum pname, const GLfloat *params )
266
GET_CURRENT_CONTEXT(ctx);
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GLint i = (GLint) (light - GL_LIGHT0);
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if (i < 0 || i >= (GLint) ctx->Const.MaxLights) {
271
_mesa_error( ctx, GL_INVALID_ENUM, "glLight(light=0x%x)", light );
275
/* do particular error checks, transformations */
283
/* transform position by ModelView matrix */
284
TRANSFORM_POINT(temp, ctx->ModelviewMatrixStack.Top->m, params);
287
case GL_SPOT_DIRECTION:
288
/* transform direction by inverse modelview */
289
if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
290
_math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
292
TRANSFORM_DIRECTION(temp, params, ctx->ModelviewMatrixStack.Top->m);
295
case GL_SPOT_EXPONENT:
296
if (params[0] < 0.0F || params[0] > ctx->Const.MaxSpotExponent) {
297
_mesa_error(ctx, GL_INVALID_VALUE, "glLight");
302
if ((params[0] < 0.0F || params[0] > 90.0F) && params[0] != 180.0F) {
303
_mesa_error(ctx, GL_INVALID_VALUE, "glLight");
307
case GL_CONSTANT_ATTENUATION:
308
case GL_LINEAR_ATTENUATION:
309
case GL_QUADRATIC_ATTENUATION:
310
if (params[0] < 0.0F) {
311
_mesa_error(ctx, GL_INVALID_VALUE, "glLight");
316
_mesa_error(ctx, GL_INVALID_ENUM, "glLight(pname=0x%x)", pname);
320
do_light(ctx, i, pname, params);
325
_mesa_Lighti( GLenum light, GLenum pname, GLint param )
329
iparam[1] = iparam[2] = iparam[3] = 0;
330
_mesa_Lightiv( light, pname, iparam );
335
_mesa_Lightiv( GLenum light, GLenum pname, const GLint *params )
343
fparam[0] = INT_TO_FLOAT( params[0] );
344
fparam[1] = INT_TO_FLOAT( params[1] );
345
fparam[2] = INT_TO_FLOAT( params[2] );
346
fparam[3] = INT_TO_FLOAT( params[3] );
349
fparam[0] = (GLfloat) params[0];
350
fparam[1] = (GLfloat) params[1];
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fparam[2] = (GLfloat) params[2];
352
fparam[3] = (GLfloat) params[3];
354
case GL_SPOT_DIRECTION:
355
fparam[0] = (GLfloat) params[0];
356
fparam[1] = (GLfloat) params[1];
357
fparam[2] = (GLfloat) params[2];
359
case GL_SPOT_EXPONENT:
361
case GL_CONSTANT_ATTENUATION:
362
case GL_LINEAR_ATTENUATION:
363
case GL_QUADRATIC_ATTENUATION:
364
fparam[0] = (GLfloat) params[0];
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/* error will be caught later in gl_Lightfv */
371
_mesa_Lightfv( light, pname, fparam );
377
_mesa_GetLightfv( GLenum light, GLenum pname, GLfloat *params )
379
GET_CURRENT_CONTEXT(ctx);
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GLint l = (GLint) (light - GL_LIGHT0);
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if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
383
_mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
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COPY_4V( params, ctx->Light.LightSource[l].Ambient );
392
COPY_4V( params, ctx->Light.LightSource[l].Diffuse );
395
COPY_4V( params, ctx->Light.LightSource[l].Specular );
398
COPY_4V( params, ctx->Light.LightSource[l].EyePosition );
400
case GL_SPOT_DIRECTION:
401
COPY_3V( params, ctx->Light.LightSource[l].SpotDirection );
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case GL_SPOT_EXPONENT:
404
params[0] = ctx->Light.LightSource[l].SpotExponent;
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params[0] = ctx->Light.LightSource[l].SpotCutoff;
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case GL_CONSTANT_ATTENUATION:
410
params[0] = ctx->Light.LightSource[l].ConstantAttenuation;
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case GL_LINEAR_ATTENUATION:
413
params[0] = ctx->Light.LightSource[l].LinearAttenuation;
415
case GL_QUADRATIC_ATTENUATION:
416
params[0] = ctx->Light.LightSource[l].QuadraticAttenuation;
419
_mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
426
_mesa_GetLightiv( GLenum light, GLenum pname, GLint *params )
428
GET_CURRENT_CONTEXT(ctx);
429
GLint l = (GLint) (light - GL_LIGHT0);
431
if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
432
_mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
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params[0] = FLOAT_TO_INT(ctx->Light.LightSource[l].Ambient[0]);
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params[1] = FLOAT_TO_INT(ctx->Light.LightSource[l].Ambient[1]);
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params[2] = FLOAT_TO_INT(ctx->Light.LightSource[l].Ambient[2]);
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params[3] = FLOAT_TO_INT(ctx->Light.LightSource[l].Ambient[3]);
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params[0] = FLOAT_TO_INT(ctx->Light.LightSource[l].Diffuse[0]);
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params[1] = FLOAT_TO_INT(ctx->Light.LightSource[l].Diffuse[1]);
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params[2] = FLOAT_TO_INT(ctx->Light.LightSource[l].Diffuse[2]);
447
params[3] = FLOAT_TO_INT(ctx->Light.LightSource[l].Diffuse[3]);
450
params[0] = FLOAT_TO_INT(ctx->Light.LightSource[l].Specular[0]);
451
params[1] = FLOAT_TO_INT(ctx->Light.LightSource[l].Specular[1]);
452
params[2] = FLOAT_TO_INT(ctx->Light.LightSource[l].Specular[2]);
453
params[3] = FLOAT_TO_INT(ctx->Light.LightSource[l].Specular[3]);
456
params[0] = (GLint) ctx->Light.LightSource[l].EyePosition[0];
457
params[1] = (GLint) ctx->Light.LightSource[l].EyePosition[1];
458
params[2] = (GLint) ctx->Light.LightSource[l].EyePosition[2];
459
params[3] = (GLint) ctx->Light.LightSource[l].EyePosition[3];
461
case GL_SPOT_DIRECTION:
462
params[0] = (GLint) ctx->Light.LightSource[l].SpotDirection[0];
463
params[1] = (GLint) ctx->Light.LightSource[l].SpotDirection[1];
464
params[2] = (GLint) ctx->Light.LightSource[l].SpotDirection[2];
466
case GL_SPOT_EXPONENT:
467
params[0] = (GLint) ctx->Light.LightSource[l].SpotExponent;
470
params[0] = (GLint) ctx->Light.LightSource[l].SpotCutoff;
472
case GL_CONSTANT_ATTENUATION:
473
params[0] = (GLint) ctx->Light.LightSource[l].ConstantAttenuation;
475
case GL_LINEAR_ATTENUATION:
476
params[0] = (GLint) ctx->Light.LightSource[l].LinearAttenuation;
478
case GL_QUADRATIC_ATTENUATION:
479
params[0] = (GLint) ctx->Light.LightSource[l].QuadraticAttenuation;
482
_mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
489
/**********************************************************************/
490
/*** Light Model ***/
491
/**********************************************************************/
495
_mesa_LightModelfv( GLenum pname, const GLfloat *params )
499
GET_CURRENT_CONTEXT(ctx);
502
case GL_LIGHT_MODEL_AMBIENT:
503
if (TEST_EQ_4V( ctx->Light.Model.Ambient, params ))
505
FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS, GL_LIGHTING_BIT);
506
COPY_4V( ctx->Light.Model.Ambient, params );
508
case GL_LIGHT_MODEL_LOCAL_VIEWER:
509
if (ctx->API != API_OPENGL_COMPAT)
511
newbool = (params[0] != 0.0F);
512
if (ctx->Light.Model.LocalViewer == newbool)
514
FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS | _NEW_FF_VERT_PROGRAM,
516
ctx->Light.Model.LocalViewer = newbool;
518
case GL_LIGHT_MODEL_TWO_SIDE:
519
newbool = (params[0] != 0.0F);
520
if (ctx->Light.Model.TwoSide == newbool)
522
FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS | _NEW_FF_VERT_PROGRAM |
523
_NEW_LIGHT_STATE, GL_LIGHTING_BIT);
524
ctx->Light.Model.TwoSide = newbool;
526
case GL_LIGHT_MODEL_COLOR_CONTROL:
527
if (ctx->API != API_OPENGL_COMPAT)
529
if (params[0] == (GLfloat) GL_SINGLE_COLOR)
530
newenum = GL_SINGLE_COLOR;
531
else if (params[0] == (GLfloat) GL_SEPARATE_SPECULAR_COLOR)
532
newenum = GL_SEPARATE_SPECULAR_COLOR;
534
_mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(param=0x0%x)",
538
if (ctx->Light.Model.ColorControl == newenum)
540
FLUSH_VERTICES(ctx, _NEW_LIGHT_CONSTANTS | _NEW_FF_VERT_PROGRAM |
541
_NEW_FF_FRAG_PROGRAM, GL_LIGHTING_BIT);
542
ctx->Light.Model.ColorControl = newenum;
551
_mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(pname=0x%x)", pname );
557
_mesa_LightModeliv( GLenum pname, const GLint *params )
562
case GL_LIGHT_MODEL_AMBIENT:
563
fparam[0] = INT_TO_FLOAT( params[0] );
564
fparam[1] = INT_TO_FLOAT( params[1] );
565
fparam[2] = INT_TO_FLOAT( params[2] );
566
fparam[3] = INT_TO_FLOAT( params[3] );
568
case GL_LIGHT_MODEL_LOCAL_VIEWER:
569
case GL_LIGHT_MODEL_TWO_SIDE:
570
case GL_LIGHT_MODEL_COLOR_CONTROL:
571
fparam[0] = (GLfloat) params[0];
574
/* Error will be caught later in gl_LightModelfv */
575
ASSIGN_4V(fparam, 0.0F, 0.0F, 0.0F, 0.0F);
577
_mesa_LightModelfv( pname, fparam );
582
_mesa_LightModeli( GLenum pname, GLint param )
586
iparam[1] = iparam[2] = iparam[3] = 0;
587
_mesa_LightModeliv( pname, iparam );
592
_mesa_LightModelf( GLenum pname, GLfloat param )
596
fparam[1] = fparam[2] = fparam[3] = 0.0F;
597
_mesa_LightModelfv( pname, fparam );
602
/********** MATERIAL **********/
606
* Given a face and pname value (ala glColorMaterial), compute a bitmask
607
* of the targeted material values.
610
_mesa_material_bitmask( struct gl_context *ctx, GLenum face, GLenum pname,
611
GLuint legal, const char *where )
615
/* Make a bitmask indicating what material attribute(s) we're updating */
618
bitmask |= MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION;
621
bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
624
bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
627
bitmask |= MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR;
630
bitmask |= MAT_BIT_FRONT_SHININESS | MAT_BIT_BACK_SHININESS;
632
case GL_AMBIENT_AND_DIFFUSE:
633
bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
634
bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
636
case GL_COLOR_INDEXES:
637
bitmask |= MAT_BIT_FRONT_INDEXES | MAT_BIT_BACK_INDEXES;
640
_mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
644
if (face==GL_FRONT) {
645
bitmask &= FRONT_MATERIAL_BITS;
647
else if (face==GL_BACK) {
648
bitmask &= BACK_MATERIAL_BITS;
650
else if (face != GL_FRONT_AND_BACK) {
651
_mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
655
if (bitmask & ~legal) {
656
_mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
665
/* Update derived values following a change in ctx->Light.Material
668
_mesa_update_material( struct gl_context *ctx, GLuint bitmask )
670
GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
672
if (MESA_VERBOSE & VERBOSE_MATERIAL)
673
_mesa_debug(ctx, "_mesa_update_material, mask 0x%x\n", bitmask);
678
/* update material ambience */
679
if (bitmask & MAT_BIT_FRONT_AMBIENT) {
680
GLbitfield mask = ctx->Light._EnabledLights;
682
const int i = u_bit_scan(&mask);
683
struct gl_light *light = &ctx->Light.Light[i];
684
struct gl_light_uniforms *lu = &ctx->Light.LightSource[i];
685
SCALE_3V( light->_MatAmbient[0], lu->Ambient,
686
mat[MAT_ATTRIB_FRONT_AMBIENT]);
690
if (bitmask & MAT_BIT_BACK_AMBIENT) {
691
GLbitfield mask = ctx->Light._EnabledLights;
693
const int i = u_bit_scan(&mask);
694
struct gl_light *light = &ctx->Light.Light[i];
695
struct gl_light_uniforms *lu = &ctx->Light.LightSource[i];
696
SCALE_3V( light->_MatAmbient[1], lu->Ambient,
697
mat[MAT_ATTRIB_BACK_AMBIENT]);
701
/* update BaseColor = emission + scene's ambience * material's ambience */
702
if (bitmask & (MAT_BIT_FRONT_EMISSION | MAT_BIT_FRONT_AMBIENT)) {
703
COPY_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_EMISSION] );
704
ACC_SCALE_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_AMBIENT],
705
ctx->Light.Model.Ambient );
708
if (bitmask & (MAT_BIT_BACK_EMISSION | MAT_BIT_BACK_AMBIENT)) {
709
COPY_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_EMISSION] );
710
ACC_SCALE_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_AMBIENT],
711
ctx->Light.Model.Ambient );
714
/* update material diffuse values */
715
if (bitmask & MAT_BIT_FRONT_DIFFUSE) {
716
GLbitfield mask = ctx->Light._EnabledLights;
718
const int i = u_bit_scan(&mask);
719
struct gl_light *light = &ctx->Light.Light[i];
720
struct gl_light_uniforms *lu = &ctx->Light.LightSource[i];
721
SCALE_3V( light->_MatDiffuse[0], lu->Diffuse,
722
mat[MAT_ATTRIB_FRONT_DIFFUSE] );
726
if (bitmask & MAT_BIT_BACK_DIFFUSE) {
727
GLbitfield mask = ctx->Light._EnabledLights;
729
const int i = u_bit_scan(&mask);
730
struct gl_light *light = &ctx->Light.Light[i];
731
struct gl_light_uniforms *lu = &ctx->Light.LightSource[i];
732
SCALE_3V( light->_MatDiffuse[1], lu->Diffuse,
733
mat[MAT_ATTRIB_BACK_DIFFUSE] );
737
/* update material specular values */
738
if (bitmask & MAT_BIT_FRONT_SPECULAR) {
739
GLbitfield mask = ctx->Light._EnabledLights;
741
const int i = u_bit_scan(&mask);
742
struct gl_light *light = &ctx->Light.Light[i];
743
struct gl_light_uniforms *lu = &ctx->Light.LightSource[i];
744
SCALE_3V( light->_MatSpecular[0], lu->Specular,
745
mat[MAT_ATTRIB_FRONT_SPECULAR]);
749
if (bitmask & MAT_BIT_BACK_SPECULAR) {
750
GLbitfield mask = ctx->Light._EnabledLights;
752
const int i = u_bit_scan(&mask);
753
struct gl_light *light = &ctx->Light.Light[i];
754
struct gl_light_uniforms *lu = &ctx->Light.LightSource[i];
755
SCALE_3V( light->_MatSpecular[1], lu->Specular,
756
mat[MAT_ATTRIB_BACK_SPECULAR]);
763
* Update the current materials from the given rgba color
764
* according to the bitmask in _ColorMaterialBitmask, which is
765
* set by glColorMaterial().
768
_mesa_update_color_material( struct gl_context *ctx, const GLfloat color[4] )
770
GLbitfield bitmask = ctx->Light._ColorMaterialBitmask;
771
struct gl_material *mat = &ctx->Light.Material;
774
const int i = u_bit_scan(&bitmask);
776
if (memcmp(mat->Attrib[i], color, sizeof(mat->Attrib[i]))) {
777
COPY_4FV(mat->Attrib[i], color);
778
ctx->NewState |= _NEW_MATERIAL;
785
_mesa_ColorMaterial( GLenum face, GLenum mode )
787
GET_CURRENT_CONTEXT(ctx);
789
GLuint legal = (MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION |
790
MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR |
791
MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE |
792
MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT);
794
if (MESA_VERBOSE&VERBOSE_API)
795
_mesa_debug(ctx, "glColorMaterial %s %s\n",
796
_mesa_enum_to_string(face),
797
_mesa_enum_to_string(mode));
799
bitmask = _mesa_material_bitmask(ctx, face, mode, legal, "glColorMaterial");
801
return; /* error was recorded */
803
if (ctx->Light._ColorMaterialBitmask == bitmask &&
804
ctx->Light.ColorMaterialFace == face &&
805
ctx->Light.ColorMaterialMode == mode)
808
FLUSH_VERTICES(ctx, 0, GL_LIGHTING_BIT);
809
ctx->Light._ColorMaterialBitmask = bitmask;
810
ctx->Light.ColorMaterialFace = face;
811
ctx->Light.ColorMaterialMode = mode;
813
if (ctx->Light.ColorMaterialEnabled) {
814
/* Used by fixed-func vertex program. */
815
FLUSH_CURRENT(ctx, _NEW_FF_VERT_PROGRAM);
816
_mesa_update_color_material(ctx,ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
822
_mesa_GetMaterialfv( GLenum face, GLenum pname, GLfloat *params )
824
GET_CURRENT_CONTEXT(ctx);
826
GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
828
FLUSH_VERTICES(ctx, 0, 0); /* update materials */
829
FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
831
if (face==GL_FRONT) {
834
else if (face==GL_BACK) {
838
_mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(face)" );
844
COPY_4FV( params, mat[MAT_ATTRIB_AMBIENT(f)] );
847
COPY_4FV( params, mat[MAT_ATTRIB_DIFFUSE(f)] );
850
COPY_4FV( params, mat[MAT_ATTRIB_SPECULAR(f)] );
853
COPY_4FV( params, mat[MAT_ATTRIB_EMISSION(f)] );
856
*params = mat[MAT_ATTRIB_SHININESS(f)][0];
858
case GL_COLOR_INDEXES:
859
if (ctx->API != API_OPENGL_COMPAT) {
860
_mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
863
params[0] = mat[MAT_ATTRIB_INDEXES(f)][0];
864
params[1] = mat[MAT_ATTRIB_INDEXES(f)][1];
865
params[2] = mat[MAT_ATTRIB_INDEXES(f)][2];
868
_mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
874
_mesa_GetMaterialiv( GLenum face, GLenum pname, GLint *params )
876
GET_CURRENT_CONTEXT(ctx);
878
GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
880
assert(ctx->API == API_OPENGL_COMPAT);
882
FLUSH_VERTICES(ctx, 0, 0); /* update materials */
883
FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
885
if (face==GL_FRONT) {
888
else if (face==GL_BACK) {
892
_mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialiv(face)" );
897
params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][0] );
898
params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][1] );
899
params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][2] );
900
params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][3] );
903
params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][0] );
904
params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][1] );
905
params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][2] );
906
params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][3] );
909
params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][0] );
910
params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][1] );
911
params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][2] );
912
params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][3] );
915
params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][0] );
916
params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][1] );
917
params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][2] );
918
params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][3] );
921
*params = lroundf( mat[MAT_ATTRIB_SHININESS(f)][0] );
923
case GL_COLOR_INDEXES:
924
params[0] = lroundf( mat[MAT_ATTRIB_INDEXES(f)][0] );
925
params[1] = lroundf( mat[MAT_ATTRIB_INDEXES(f)][1] );
926
params[2] = lroundf( mat[MAT_ATTRIB_INDEXES(f)][2] );
929
_mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
936
* Examine current lighting parameters to determine if the optimized lighting
937
* function can be used.
938
* Also, precompute some lighting values such as the products of light
939
* source and material ambient, diffuse and specular coefficients.
942
_mesa_update_lighting( struct gl_context *ctx )
944
GLbitfield flags = 0;
945
bool old_need_eye_coords = ctx->Light._NeedEyeCoords;
946
ctx->Light._NeedEyeCoords = GL_FALSE;
948
if (!ctx->Light.Enabled) {
949
return old_need_eye_coords != ctx->Light._NeedEyeCoords ?
953
GLbitfield mask = ctx->Light._EnabledLights;
955
const int i = u_bit_scan(&mask);
956
struct gl_light *light = &ctx->Light.Light[i];
957
flags |= light->_Flags;
960
ctx->Light._NeedVertices =
961
((flags & (LIGHT_POSITIONAL|LIGHT_SPOT)) ||
962
ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR ||
963
ctx->Light.Model.LocalViewer);
965
ctx->Light._NeedEyeCoords = ((flags & LIGHT_POSITIONAL) ||
966
ctx->Light.Model.LocalViewer);
968
/* XXX: This test is overkill & needs to be fixed both for software and
969
* hardware t&l drivers. The above should be sufficient & should
970
* be tested to verify this.
972
if (ctx->Light._NeedVertices)
973
ctx->Light._NeedEyeCoords = GL_TRUE;
975
return old_need_eye_coords != ctx->Light._NeedEyeCoords ?
980
_mesa_update_light_materials(struct gl_context *ctx)
982
/* Precompute some shading values. Although we reference
983
* Light.Material here, we can get away without flushing
984
* FLUSH_UPDATE_CURRENT, as when any outstanding material changes
985
* are flushed, they will update the derived state at that time.
987
if (ctx->Light.Model.TwoSide)
988
_mesa_update_material(ctx,
989
MAT_BIT_FRONT_EMISSION |
990
MAT_BIT_FRONT_AMBIENT |
991
MAT_BIT_FRONT_DIFFUSE |
992
MAT_BIT_FRONT_SPECULAR |
993
MAT_BIT_BACK_EMISSION |
994
MAT_BIT_BACK_AMBIENT |
995
MAT_BIT_BACK_DIFFUSE |
996
MAT_BIT_BACK_SPECULAR);
998
_mesa_update_material(ctx,
999
MAT_BIT_FRONT_EMISSION |
1000
MAT_BIT_FRONT_AMBIENT |
1001
MAT_BIT_FRONT_DIFFUSE |
1002
MAT_BIT_FRONT_SPECULAR);
1007
* Update state derived from light position, spot direction.
1010
* _NEW_LIGHT_CONSTANTS
1011
* _TNL_NEW_NEED_EYE_COORDS
1013
* Update on (_NEW_MODELVIEW | _NEW_LIGHT_CONSTANTS) when lighting is enabled.
1014
* Also update on lighting space changes.
1017
compute_light_positions( struct gl_context *ctx )
1019
static const GLfloat eye_z[3] = { 0, 0, 1 };
1021
if (!ctx->Light.Enabled)
1024
if (ctx->_NeedEyeCoords) {
1025
COPY_3V( ctx->_EyeZDir, eye_z );
1028
TRANSFORM_NORMAL( ctx->_EyeZDir, eye_z, ctx->ModelviewMatrixStack.Top->m );
1031
GLbitfield mask = ctx->Light._EnabledLights;
1033
const int i = u_bit_scan(&mask);
1034
struct gl_light *light = &ctx->Light.Light[i];
1035
struct gl_light_uniforms *lu = &ctx->Light.LightSource[i];
1037
if (ctx->_NeedEyeCoords) {
1038
/* _Position is in eye coordinate space */
1039
COPY_4FV( light->_Position, lu->EyePosition );
1042
/* _Position is in object coordinate space */
1043
TRANSFORM_POINT( light->_Position, ctx->ModelviewMatrixStack.Top->inv,
1047
if (!(light->_Flags & LIGHT_POSITIONAL)) {
1048
/* VP (VP) = Normalize( Position ) */
1049
COPY_3V( light->_VP_inf_norm, light->_Position );
1050
NORMALIZE_3FV( light->_VP_inf_norm );
1052
if (!ctx->Light.Model.LocalViewer) {
1053
/* _h_inf_norm = Normalize( V_to_P + <0,0,1> ) */
1054
ADD_3V( light->_h_inf_norm, light->_VP_inf_norm, ctx->_EyeZDir);
1055
NORMALIZE_3FV( light->_h_inf_norm );
1057
light->_VP_inf_spot_attenuation = 1.0;
1060
/* positional light w/ homogeneous coordinate, divide by W */
1061
GLfloat wInv = 1.0F / light->_Position[3];
1062
light->_Position[0] *= wInv;
1063
light->_Position[1] *= wInv;
1064
light->_Position[2] *= wInv;
1067
if (light->_Flags & LIGHT_SPOT) {
1068
/* Note: we normalize the spot direction now */
1070
if (ctx->_NeedEyeCoords) {
1071
COPY_3V( light->_NormSpotDirection, lu->SpotDirection );
1072
NORMALIZE_3FV( light->_NormSpotDirection );
1076
COPY_3V(spotDir, lu->SpotDirection);
1077
NORMALIZE_3FV(spotDir);
1078
TRANSFORM_NORMAL( light->_NormSpotDirection,
1080
ctx->ModelviewMatrixStack.Top->m);
1083
NORMALIZE_3FV( light->_NormSpotDirection );
1085
if (!(light->_Flags & LIGHT_POSITIONAL)) {
1086
GLfloat PV_dot_dir = - DOT3(light->_VP_inf_norm,
1087
light->_NormSpotDirection);
1089
if (PV_dot_dir > lu->_CosCutoff) {
1090
light->_VP_inf_spot_attenuation =
1091
powf(PV_dot_dir, lu->SpotExponent);
1094
light->_VP_inf_spot_attenuation = 0;
1104
update_modelview_scale( struct gl_context *ctx )
1106
ctx->_ModelViewInvScale = 1.0F;
1107
ctx->_ModelViewInvScaleEyespace = 1.0F;
1108
if (!_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top)) {
1109
const GLfloat *m = ctx->ModelviewMatrixStack.Top->inv;
1110
GLfloat f = m[2] * m[2] + m[6] * m[6] + m[10] * m[10];
1111
if (f < 1e-12f) f = 1.0f;
1112
if (ctx->_NeedEyeCoords)
1113
ctx->_ModelViewInvScale = 1.0f / sqrtf(f);
1115
ctx->_ModelViewInvScale = sqrtf(f);
1116
ctx->_ModelViewInvScaleEyespace = 1.0f / sqrtf(f);
1122
* Bring up to date any state that relies on _NeedEyeCoords.
1124
* Return true if ctx->_NeedEyeCoords has been changed.
1127
_mesa_update_tnl_spaces( struct gl_context *ctx, GLuint new_state )
1129
const GLuint oldneedeyecoords = ctx->_NeedEyeCoords;
1132
ctx->_NeedEyeCoords = GL_FALSE;
1134
if ((ctx->Texture._GenFlags & TEXGEN_NEED_EYE_COORD) ||
1135
ctx->Point._Attenuated ||
1136
ctx->Light._NeedEyeCoords)
1137
ctx->_NeedEyeCoords = GL_TRUE;
1139
if (ctx->Light.Enabled &&
1140
!_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top))
1141
ctx->_NeedEyeCoords = GL_TRUE;
1143
/* Check if the truth-value interpretations of the bitfields have
1146
if (oldneedeyecoords != ctx->_NeedEyeCoords) {
1147
/* Recalculate all state that depends on _NeedEyeCoords.
1149
update_modelview_scale(ctx);
1150
compute_light_positions( ctx );
1155
GLuint new_state2 = ctx->NewState;
1157
/* Recalculate that same state only if it has been invalidated
1158
* by other statechanges.
1160
if (new_state2 & _NEW_MODELVIEW)
1161
update_modelview_scale(ctx);
1163
if (new_state2 & (_NEW_LIGHT_CONSTANTS | _NEW_MODELVIEW))
1164
compute_light_positions( ctx );
1171
/**********************************************************************/
1172
/***** Initialization *****/
1173
/**********************************************************************/
1176
* Initialize the n-th light data structure.
1178
* \param l pointer to the gl_light structure to be initialized.
1179
* \param n number of the light.
1180
* \note The defaults for light 0 are different than the other lights.
1183
init_light( struct gl_light *l, struct gl_light_uniforms *lu, GLuint n )
1185
ASSIGN_4V( lu->Ambient, 0.0, 0.0, 0.0, 1.0 );
1187
ASSIGN_4V( lu->Diffuse, 1.0, 1.0, 1.0, 1.0 );
1188
ASSIGN_4V( lu->Specular, 1.0, 1.0, 1.0, 1.0 );
1191
ASSIGN_4V( lu->Diffuse, 0.0, 0.0, 0.0, 1.0 );
1192
ASSIGN_4V( lu->Specular, 0.0, 0.0, 0.0, 1.0 );
1194
ASSIGN_4V( lu->EyePosition, 0.0, 0.0, 1.0, 0.0 );
1195
ASSIGN_3V( lu->SpotDirection, 0.0, 0.0, -1.0 );
1196
lu->SpotExponent = 0.0;
1197
lu->SpotCutoff = 180.0;
1198
lu->_CosCutoff = 0.0; /* KW: -ve values not admitted */
1199
lu->ConstantAttenuation = 1.0;
1200
lu->LinearAttenuation = 0.0;
1201
lu->QuadraticAttenuation = 0.0;
1202
l->Enabled = GL_FALSE;
1207
* Initialize the light model data structure.
1209
* \param lm pointer to the gl_lightmodel structure to be initialized.
1212
init_lightmodel( struct gl_lightmodel *lm )
1214
ASSIGN_4V( lm->Ambient, 0.2F, 0.2F, 0.2F, 1.0F );
1215
lm->LocalViewer = GL_FALSE;
1216
lm->TwoSide = GL_FALSE;
1217
lm->ColorControl = GL_SINGLE_COLOR;
1222
* Initialize the material data structure.
1224
* \param m pointer to the gl_material structure to be initialized.
1227
init_material( struct gl_material *m )
1229
ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_AMBIENT], 0.2F, 0.2F, 0.2F, 1.0F );
1230
ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_DIFFUSE], 0.8F, 0.8F, 0.8F, 1.0F );
1231
ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
1232
ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
1233
ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
1234
ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
1236
ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_AMBIENT], 0.2F, 0.2F, 0.2F, 1.0F );
1237
ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_DIFFUSE], 0.8F, 0.8F, 0.8F, 1.0F );
1238
ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
1239
ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
1240
ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
1241
ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
1246
* Initialize all lighting state for the given context.
1249
_mesa_init_lighting( struct gl_context *ctx )
1253
/* Lighting group */
1254
ctx->Light._EnabledLights = 0;
1255
for (i = 0; i < MAX_LIGHTS; i++) {
1256
init_light( &ctx->Light.Light[i], &ctx->Light.LightSource[i], i );
1259
init_lightmodel( &ctx->Light.Model );
1260
init_material( &ctx->Light.Material );
1261
ctx->Light.ShadeModel = GL_SMOOTH;
1262
ctx->Light.ProvokingVertex = GL_LAST_VERTEX_CONVENTION_EXT;
1263
ctx->Light.Enabled = GL_FALSE;
1264
ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
1265
ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;
1266
ctx->Light._ColorMaterialBitmask = _mesa_material_bitmask( ctx,
1268
GL_AMBIENT_AND_DIFFUSE, ~0,
1271
ctx->Light.ColorMaterialEnabled = GL_FALSE;
1272
ctx->Light.ClampVertexColor = ctx->API == API_OPENGL_COMPAT;
1273
ctx->Light._ClampVertexColor = ctx->API == API_OPENGL_COMPAT;
1276
ctx->Light._NeedEyeCoords = GL_FALSE;
1277
ctx->_NeedEyeCoords = GL_FALSE;
1278
ctx->_ModelViewInvScale = 1.0;
1279
ctx->_ModelViewInvScaleEyespace = 1.0;
added
removed
src/mesa/main/light.c
