0,0 → 1,968 |
/* |
* Mesa 3-D graphics library |
* |
* Copyright (C) 1999-2007 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 texstate.c |
* |
* Texture state handling. |
*/ |
|
#include <stdio.h> |
#include "glheader.h" |
#include "bufferobj.h" |
#include "context.h" |
#include "enums.h" |
#include "macros.h" |
#include "shaderimage.h" |
#include "texobj.h" |
#include "teximage.h" |
#include "texstate.h" |
#include "mtypes.h" |
#include "util/bitset.h" |
|
|
/** |
* Default texture combine environment state. This is used to initialize |
* a context's texture units and as the basis for converting "classic" |
* texture environmnets to ARB_texture_env_combine style values. |
*/ |
static const struct gl_tex_env_combine_state default_combine_state = { |
GL_MODULATE, GL_MODULATE, |
{ GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT }, |
{ GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT }, |
{ GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_ALPHA, GL_SRC_ALPHA }, |
{ GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA }, |
0, 0, |
2, 2 |
}; |
|
|
|
/** |
* Used by glXCopyContext to copy texture state from one context to another. |
*/ |
void |
_mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst ) |
{ |
GLuint u, tex; |
|
assert(src); |
assert(dst); |
|
dst->Texture.CurrentUnit = src->Texture.CurrentUnit; |
dst->Texture._GenFlags = src->Texture._GenFlags; |
dst->Texture._TexGenEnabled = src->Texture._TexGenEnabled; |
dst->Texture._TexMatEnabled = src->Texture._TexMatEnabled; |
|
/* per-unit state */ |
for (u = 0; u < src->Const.MaxCombinedTextureImageUnits; u++) { |
dst->Texture.Unit[u].Enabled = src->Texture.Unit[u].Enabled; |
dst->Texture.Unit[u].EnvMode = src->Texture.Unit[u].EnvMode; |
COPY_4V(dst->Texture.Unit[u].EnvColor, src->Texture.Unit[u].EnvColor); |
dst->Texture.Unit[u].TexGenEnabled = src->Texture.Unit[u].TexGenEnabled; |
dst->Texture.Unit[u].GenS = src->Texture.Unit[u].GenS; |
dst->Texture.Unit[u].GenT = src->Texture.Unit[u].GenT; |
dst->Texture.Unit[u].GenR = src->Texture.Unit[u].GenR; |
dst->Texture.Unit[u].GenQ = src->Texture.Unit[u].GenQ; |
dst->Texture.Unit[u].LodBias = src->Texture.Unit[u].LodBias; |
|
/* GL_EXT_texture_env_combine */ |
dst->Texture.Unit[u].Combine = src->Texture.Unit[u].Combine; |
|
/* |
* XXX strictly speaking, we should compare texture names/ids and |
* bind textures in the dest context according to id. For now, only |
* copy bindings if the contexts share the same pool of textures to |
* avoid refcounting bugs. |
*/ |
if (dst->Shared == src->Shared) { |
/* copy texture object bindings, not contents of texture objects */ |
_mesa_lock_context_textures(dst); |
|
for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) { |
_mesa_reference_texobj(&dst->Texture.Unit[u].CurrentTex[tex], |
src->Texture.Unit[u].CurrentTex[tex]); |
if (src->Texture.Unit[u].CurrentTex[tex]) { |
dst->Texture.NumCurrentTexUsed = |
MAX2(dst->Texture.NumCurrentTexUsed, u + 1); |
} |
} |
dst->Texture.Unit[u]._BoundTextures = src->Texture.Unit[u]._BoundTextures; |
_mesa_unlock_context_textures(dst); |
} |
} |
} |
|
|
/* |
* For debugging |
*/ |
void |
_mesa_print_texunit_state( struct gl_context *ctx, GLuint unit ) |
{ |
const struct gl_texture_unit *texUnit = ctx->Texture.Unit + unit; |
printf("Texture Unit %d\n", unit); |
printf(" GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit->EnvMode)); |
printf(" GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeRGB)); |
printf(" GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeA)); |
printf(" GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[0])); |
printf(" GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[1])); |
printf(" GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[2])); |
printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[0])); |
printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[1])); |
printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[2])); |
printf(" GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[0])); |
printf(" GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[1])); |
printf(" GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[2])); |
printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[0])); |
printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[1])); |
printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[2])); |
printf(" GL_RGB_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftRGB); |
printf(" GL_ALPHA_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftA); |
printf(" GL_TEXTURE_ENV_COLOR = (%f, %f, %f, %f)\n", texUnit->EnvColor[0], texUnit->EnvColor[1], texUnit->EnvColor[2], texUnit->EnvColor[3]); |
} |
|
|
|
/**********************************************************************/ |
/* Texture Environment */ |
/**********************************************************************/ |
|
/** |
* Convert "classic" texture environment to ARB_texture_env_combine style |
* environments. |
* |
* \param state texture_env_combine state vector to be filled-in. |
* \param mode Classic texture environment mode (i.e., \c GL_REPLACE, |
* \c GL_BLEND, \c GL_DECAL, etc.). |
* \param texBaseFormat Base format of the texture associated with the |
* texture unit. |
*/ |
static void |
calculate_derived_texenv( struct gl_tex_env_combine_state *state, |
GLenum mode, GLenum texBaseFormat ) |
{ |
GLenum mode_rgb; |
GLenum mode_a; |
|
*state = default_combine_state; |
|
switch (texBaseFormat) { |
case GL_ALPHA: |
state->SourceRGB[0] = GL_PREVIOUS; |
break; |
|
case GL_LUMINANCE_ALPHA: |
case GL_INTENSITY: |
case GL_RGBA: |
break; |
|
case GL_LUMINANCE: |
case GL_RED: |
case GL_RG: |
case GL_RGB: |
case GL_YCBCR_MESA: |
state->SourceA[0] = GL_PREVIOUS; |
break; |
|
default: |
_mesa_problem(NULL, |
"Invalid texBaseFormat 0x%x in calculate_derived_texenv", |
texBaseFormat); |
return; |
} |
|
if (mode == GL_REPLACE_EXT) |
mode = GL_REPLACE; |
|
switch (mode) { |
case GL_REPLACE: |
case GL_MODULATE: |
mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : mode; |
mode_a = mode; |
break; |
|
case GL_DECAL: |
mode_rgb = GL_INTERPOLATE; |
mode_a = GL_REPLACE; |
|
state->SourceA[0] = GL_PREVIOUS; |
|
/* Having alpha / luminance / intensity textures replace using the |
* incoming fragment color matches the definition in NV_texture_shader. |
* The 1.5 spec simply marks these as "undefined". |
*/ |
switch (texBaseFormat) { |
case GL_ALPHA: |
case GL_LUMINANCE: |
case GL_LUMINANCE_ALPHA: |
case GL_INTENSITY: |
state->SourceRGB[0] = GL_PREVIOUS; |
break; |
case GL_RED: |
case GL_RG: |
case GL_RGB: |
case GL_YCBCR_MESA: |
mode_rgb = GL_REPLACE; |
break; |
case GL_RGBA: |
state->SourceRGB[2] = GL_TEXTURE; |
break; |
} |
break; |
|
case GL_BLEND: |
mode_rgb = GL_INTERPOLATE; |
mode_a = GL_MODULATE; |
|
switch (texBaseFormat) { |
case GL_ALPHA: |
mode_rgb = GL_REPLACE; |
break; |
case GL_INTENSITY: |
mode_a = GL_INTERPOLATE; |
state->SourceA[0] = GL_CONSTANT; |
state->OperandA[2] = GL_SRC_ALPHA; |
/* FALLTHROUGH */ |
case GL_LUMINANCE: |
case GL_RED: |
case GL_RG: |
case GL_RGB: |
case GL_LUMINANCE_ALPHA: |
case GL_RGBA: |
case GL_YCBCR_MESA: |
state->SourceRGB[2] = GL_TEXTURE; |
state->SourceA[2] = GL_TEXTURE; |
state->SourceRGB[0] = GL_CONSTANT; |
state->OperandRGB[2] = GL_SRC_COLOR; |
break; |
} |
break; |
|
case GL_ADD: |
mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : GL_ADD; |
mode_a = (texBaseFormat == GL_INTENSITY) ? GL_ADD : GL_MODULATE; |
break; |
|
default: |
_mesa_problem(NULL, |
"Invalid texture env mode 0x%x in calculate_derived_texenv", |
mode); |
return; |
} |
|
state->ModeRGB = (state->SourceRGB[0] != GL_PREVIOUS) |
? mode_rgb : GL_REPLACE; |
state->ModeA = (state->SourceA[0] != GL_PREVIOUS) |
? mode_a : GL_REPLACE; |
} |
|
|
|
|
/* GL_ARB_multitexture */ |
void GLAPIENTRY |
_mesa_ActiveTexture(GLenum texture) |
{ |
const GLuint texUnit = texture - GL_TEXTURE0; |
GLuint k; |
GET_CURRENT_CONTEXT(ctx); |
|
k = _mesa_max_tex_unit(ctx); |
|
assert(k <= ARRAY_SIZE(ctx->Texture.Unit)); |
|
if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) |
_mesa_debug(ctx, "glActiveTexture %s\n", |
_mesa_lookup_enum_by_nr(texture)); |
|
if (texUnit >= k) { |
_mesa_error(ctx, GL_INVALID_ENUM, "glActiveTexture(texture=%s)", |
_mesa_lookup_enum_by_nr(texture)); |
return; |
} |
|
if (ctx->Texture.CurrentUnit == texUnit) |
return; |
|
FLUSH_VERTICES(ctx, _NEW_TEXTURE); |
|
ctx->Texture.CurrentUnit = texUnit; |
if (ctx->Transform.MatrixMode == GL_TEXTURE) { |
/* update current stack pointer */ |
ctx->CurrentStack = &ctx->TextureMatrixStack[texUnit]; |
} |
} |
|
|
/* GL_ARB_multitexture */ |
void GLAPIENTRY |
_mesa_ClientActiveTexture(GLenum texture) |
{ |
GET_CURRENT_CONTEXT(ctx); |
GLuint texUnit = texture - GL_TEXTURE0; |
|
if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) |
_mesa_debug(ctx, "glClientActiveTexture %s\n", |
_mesa_lookup_enum_by_nr(texture)); |
|
if (texUnit >= ctx->Const.MaxTextureCoordUnits) { |
_mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture)"); |
return; |
} |
|
if (ctx->Array.ActiveTexture == texUnit) |
return; |
|
FLUSH_VERTICES(ctx, _NEW_ARRAY); |
ctx->Array.ActiveTexture = texUnit; |
} |
|
|
|
/**********************************************************************/ |
/***** State management *****/ |
/**********************************************************************/ |
|
|
/** |
* \note This routine refers to derived texture attribute values to |
* compute the ENABLE_TEXMAT flags, but is only called on |
* _NEW_TEXTURE_MATRIX. On changes to _NEW_TEXTURE, the ENABLE_TEXMAT |
* flags are updated by _mesa_update_textures(), below. |
* |
* \param ctx GL context. |
*/ |
static void |
update_texture_matrices( struct gl_context *ctx ) |
{ |
GLuint u; |
|
ctx->Texture._TexMatEnabled = 0x0; |
|
for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) { |
assert(u < ARRAY_SIZE(ctx->TextureMatrixStack)); |
if (_math_matrix_is_dirty(ctx->TextureMatrixStack[u].Top)) { |
_math_matrix_analyse( ctx->TextureMatrixStack[u].Top ); |
|
if (ctx->Texture.Unit[u]._Current && |
ctx->TextureMatrixStack[u].Top->type != MATRIX_IDENTITY) |
ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(u); |
} |
} |
} |
|
|
/** |
* Examine texture unit's combine/env state to update derived state. |
*/ |
static void |
update_tex_combine(struct gl_context *ctx, struct gl_texture_unit *texUnit) |
{ |
struct gl_tex_env_combine_state *combine; |
|
/* No combiners will apply to this. */ |
if (texUnit->_Current->Target == GL_TEXTURE_BUFFER) |
return; |
|
/* Set the texUnit->_CurrentCombine field to point to the user's combiner |
* state, or the combiner state which is derived from traditional texenv |
* mode. |
*/ |
if (texUnit->EnvMode == GL_COMBINE || |
texUnit->EnvMode == GL_COMBINE4_NV) { |
texUnit->_CurrentCombine = & texUnit->Combine; |
} |
else { |
const struct gl_texture_object *texObj = texUnit->_Current; |
GLenum format = texObj->Image[0][texObj->BaseLevel]->_BaseFormat; |
|
if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) { |
format = texObj->DepthMode; |
} |
calculate_derived_texenv(&texUnit->_EnvMode, texUnit->EnvMode, format); |
texUnit->_CurrentCombine = & texUnit->_EnvMode; |
} |
|
combine = texUnit->_CurrentCombine; |
|
/* Determine number of source RGB terms in the combiner function */ |
switch (combine->ModeRGB) { |
case GL_REPLACE: |
combine->_NumArgsRGB = 1; |
break; |
case GL_ADD: |
case GL_ADD_SIGNED: |
if (texUnit->EnvMode == GL_COMBINE4_NV) |
combine->_NumArgsRGB = 4; |
else |
combine->_NumArgsRGB = 2; |
break; |
case GL_MODULATE: |
case GL_SUBTRACT: |
case GL_DOT3_RGB: |
case GL_DOT3_RGBA: |
case GL_DOT3_RGB_EXT: |
case GL_DOT3_RGBA_EXT: |
combine->_NumArgsRGB = 2; |
break; |
case GL_INTERPOLATE: |
case GL_MODULATE_ADD_ATI: |
case GL_MODULATE_SIGNED_ADD_ATI: |
case GL_MODULATE_SUBTRACT_ATI: |
combine->_NumArgsRGB = 3; |
break; |
default: |
combine->_NumArgsRGB = 0; |
_mesa_problem(ctx, "invalid RGB combine mode in update_texture_state"); |
return; |
} |
|
/* Determine number of source Alpha terms in the combiner function */ |
switch (combine->ModeA) { |
case GL_REPLACE: |
combine->_NumArgsA = 1; |
break; |
case GL_ADD: |
case GL_ADD_SIGNED: |
if (texUnit->EnvMode == GL_COMBINE4_NV) |
combine->_NumArgsA = 4; |
else |
combine->_NumArgsA = 2; |
break; |
case GL_MODULATE: |
case GL_SUBTRACT: |
combine->_NumArgsA = 2; |
break; |
case GL_INTERPOLATE: |
case GL_MODULATE_ADD_ATI: |
case GL_MODULATE_SIGNED_ADD_ATI: |
case GL_MODULATE_SUBTRACT_ATI: |
combine->_NumArgsA = 3; |
break; |
default: |
combine->_NumArgsA = 0; |
_mesa_problem(ctx, "invalid Alpha combine mode in update_texture_state"); |
break; |
} |
} |
|
static void |
update_texgen(struct gl_context *ctx) |
{ |
GLuint unit; |
|
/* Setup texgen for those texture coordinate sets that are in use */ |
for (unit = 0; unit < ctx->Const.MaxTextureCoordUnits; unit++) { |
struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; |
|
texUnit->_GenFlags = 0x0; |
|
if (!(ctx->Texture._EnabledCoordUnits & (1 << unit))) |
continue; |
|
if (texUnit->TexGenEnabled) { |
if (texUnit->TexGenEnabled & S_BIT) { |
texUnit->_GenFlags |= texUnit->GenS._ModeBit; |
} |
if (texUnit->TexGenEnabled & T_BIT) { |
texUnit->_GenFlags |= texUnit->GenT._ModeBit; |
} |
if (texUnit->TexGenEnabled & R_BIT) { |
texUnit->_GenFlags |= texUnit->GenR._ModeBit; |
} |
if (texUnit->TexGenEnabled & Q_BIT) { |
texUnit->_GenFlags |= texUnit->GenQ._ModeBit; |
} |
|
ctx->Texture._TexGenEnabled |= ENABLE_TEXGEN(unit); |
ctx->Texture._GenFlags |= texUnit->_GenFlags; |
} |
|
assert(unit < ARRAY_SIZE(ctx->TextureMatrixStack)); |
if (ctx->TextureMatrixStack[unit].Top->type != MATRIX_IDENTITY) |
ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(unit); |
} |
} |
|
static struct gl_texture_object * |
update_single_program_texture(struct gl_context *ctx, struct gl_program *prog, |
int s) |
{ |
gl_texture_index target_index; |
struct gl_texture_unit *texUnit; |
struct gl_texture_object *texObj; |
struct gl_sampler_object *sampler; |
int unit; |
|
if (!(prog->SamplersUsed & (1 << s))) |
return NULL; |
|
unit = prog->SamplerUnits[s]; |
texUnit = &ctx->Texture.Unit[unit]; |
|
/* Note: If more than one bit was set in TexturesUsed[unit], then we should |
* have had the draw call rejected already. From the GL 4.4 specification, |
* section 7.10 ("Samplers"): |
* |
* "It is not allowed to have variables of different sampler types |
* pointing to the same texture image unit within a program |
* object. This situation can only be detected at the next rendering |
* command issued which triggers shader invocations, and an |
* INVALID_OPERATION error will then be generated." |
*/ |
target_index = ffs(prog->TexturesUsed[unit]) - 1; |
texObj = texUnit->CurrentTex[target_index]; |
|
sampler = texUnit->Sampler ? |
texUnit->Sampler : &texObj->Sampler; |
|
if (likely(texObj)) { |
if (_mesa_is_texture_complete(texObj, sampler)) |
return texObj; |
|
_mesa_test_texobj_completeness(ctx, texObj); |
if (_mesa_is_texture_complete(texObj, sampler)) |
return texObj; |
} |
|
/* If we've reached this point, we didn't find a complete texture of the |
* shader's target. From the GL 4.4 core specification, section 11.1.3.5 |
* ("Texture Access"): |
* |
* "If a sampler is used in a shader and the sampler’s associated |
* texture is not complete, as defined in section 8.17, (0, 0, 0, 1) |
* will be returned for a non-shadow sampler and 0 for a shadow |
* sampler." |
* |
* Mesa implements this by creating a hidden texture object with a pixel of |
* that value. |
*/ |
texObj = _mesa_get_fallback_texture(ctx, target_index); |
assert(texObj); |
|
return texObj; |
} |
|
static void |
update_program_texture_state(struct gl_context *ctx, struct gl_program **prog, |
BITSET_WORD *enabled_texture_units) |
{ |
int i; |
|
for (i = 0; i < MESA_SHADER_STAGES; i++) { |
int s; |
|
if (!prog[i]) |
continue; |
|
/* We can't only do the shifting trick as the loop condition because if |
* sampler 31 is active, the next iteration tries to shift by 32, which is |
* undefined. |
*/ |
for (s = 0; s < MAX_SAMPLERS && (1 << s) <= prog[i]->SamplersUsed; s++) { |
struct gl_texture_object *texObj; |
|
texObj = update_single_program_texture(ctx, prog[i], s); |
if (texObj) { |
int unit = prog[i]->SamplerUnits[s]; |
_mesa_reference_texobj(&ctx->Texture.Unit[unit]._Current, texObj); |
BITSET_SET(enabled_texture_units, unit); |
ctx->Texture._MaxEnabledTexImageUnit = |
MAX2(ctx->Texture._MaxEnabledTexImageUnit, (int)unit); |
} |
} |
} |
|
if (prog[MESA_SHADER_FRAGMENT]) { |
const GLuint coordMask = (1 << MAX_TEXTURE_COORD_UNITS) - 1; |
ctx->Texture._EnabledCoordUnits |= |
(prog[MESA_SHADER_FRAGMENT]->InputsRead >> VARYING_SLOT_TEX0) & |
coordMask; |
} |
} |
|
static void |
update_ff_texture_state(struct gl_context *ctx, |
BITSET_WORD *enabled_texture_units) |
{ |
int unit; |
|
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { |
struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; |
GLuint texIndex; |
|
if (texUnit->Enabled == 0x0) |
continue; |
|
/* If a shader already dictated what texture target was used for this |
* unit, just go along with it. |
*/ |
if (BITSET_TEST(enabled_texture_units, unit)) |
continue; |
|
/* From the GL 4.4 compat specification, section 16.2 ("Texture Application"): |
* |
* "Texturing is enabled or disabled using the generic Enable and |
* Disable commands, respectively, with the symbolic constants |
* TEXTURE_1D, TEXTURE_2D, TEXTURE_RECTANGLE, TEXTURE_3D, or |
* TEXTURE_CUBE_MAP to enable the one-, two-, rectangular, |
* three-dimensional, or cube map texture, respectively. If more |
* than one of these textures is enabled, the first one enabled |
* from the following list is used: |
* |
* • cube map texture |
* • three-dimensional texture |
* • rectangular texture |
* • two-dimensional texture |
* • one-dimensional texture" |
* |
* Note that the TEXTURE_x_INDEX values are in high to low priority. |
* Also: |
* |
* "If a texture unit is disabled or has an invalid or incomplete |
* texture (as defined in section 8.17) bound to it, then blending |
* is disabled for that texture unit. If the texture environment |
* for a given enabled texture unit references a disabled texture |
* unit, or an invalid or incomplete texture that is bound to |
* another unit, then the results of texture blending are |
* undefined." |
*/ |
for (texIndex = 0; texIndex < NUM_TEXTURE_TARGETS; texIndex++) { |
if (texUnit->Enabled & (1 << texIndex)) { |
struct gl_texture_object *texObj = texUnit->CurrentTex[texIndex]; |
struct gl_sampler_object *sampler = texUnit->Sampler ? |
texUnit->Sampler : &texObj->Sampler; |
|
if (!_mesa_is_texture_complete(texObj, sampler)) { |
_mesa_test_texobj_completeness(ctx, texObj); |
} |
if (_mesa_is_texture_complete(texObj, sampler)) { |
_mesa_reference_texobj(&texUnit->_Current, texObj); |
break; |
} |
} |
} |
|
if (texIndex == NUM_TEXTURE_TARGETS) |
continue; |
|
/* if we get here, we know this texture unit is enabled */ |
BITSET_SET(enabled_texture_units, unit); |
ctx->Texture._MaxEnabledTexImageUnit = |
MAX2(ctx->Texture._MaxEnabledTexImageUnit, (int)unit); |
|
ctx->Texture._EnabledCoordUnits |= 1 << unit; |
|
update_tex_combine(ctx, texUnit); |
} |
} |
|
/** |
* \note This routine refers to derived texture matrix values to |
* compute the ENABLE_TEXMAT flags, but is only called on |
* _NEW_TEXTURE. On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT |
* flags are updated by _mesa_update_texture_matrices, above. |
* |
* \param ctx GL context. |
*/ |
static void |
update_texture_state( struct gl_context *ctx ) |
{ |
struct gl_program *prog[MESA_SHADER_STAGES]; |
int i; |
int old_max_unit = ctx->Texture._MaxEnabledTexImageUnit; |
BITSET_DECLARE(enabled_texture_units, MAX_COMBINED_TEXTURE_IMAGE_UNITS); |
|
for (i = 0; i < MESA_SHADER_STAGES; i++) { |
if (ctx->_Shader->CurrentProgram[i] && |
ctx->_Shader->CurrentProgram[i]->LinkStatus) { |
prog[i] = ctx->_Shader->CurrentProgram[i]->_LinkedShaders[i]->Program; |
} else { |
if (i == MESA_SHADER_FRAGMENT && ctx->FragmentProgram._Enabled) |
prog[i] = &ctx->FragmentProgram.Current->Base; |
else |
prog[i] = NULL; |
} |
} |
|
/* TODO: only set this if there are actual changes */ |
ctx->NewState |= _NEW_TEXTURE; |
|
ctx->Texture._GenFlags = 0x0; |
ctx->Texture._TexMatEnabled = 0x0; |
ctx->Texture._TexGenEnabled = 0x0; |
ctx->Texture._MaxEnabledTexImageUnit = -1; |
ctx->Texture._EnabledCoordUnits = 0x0; |
|
memset(&enabled_texture_units, 0, sizeof(enabled_texture_units)); |
|
/* First, walk over our programs pulling in all the textures for them. |
* Programs dictate specific texture targets to be enabled, and for a draw |
* call to be valid they can't conflict about which texture targets are |
* used. |
*/ |
update_program_texture_state(ctx, prog, enabled_texture_units); |
|
/* Also pull in any textures necessary for fixed function fragment shading. |
*/ |
if (!prog[MESA_SHADER_FRAGMENT]) |
update_ff_texture_state(ctx, enabled_texture_units); |
|
/* Now, clear out the _Current of any disabled texture units. */ |
for (i = 0; i <= ctx->Texture._MaxEnabledTexImageUnit; i++) { |
if (!BITSET_TEST(enabled_texture_units, i)) |
_mesa_reference_texobj(&ctx->Texture.Unit[i]._Current, NULL); |
} |
for (i = ctx->Texture._MaxEnabledTexImageUnit + 1; i <= old_max_unit; i++) { |
_mesa_reference_texobj(&ctx->Texture.Unit[i]._Current, NULL); |
} |
|
if (!prog[MESA_SHADER_FRAGMENT] || !prog[MESA_SHADER_VERTEX]) |
update_texgen(ctx); |
|
_mesa_validate_image_units(ctx); |
} |
|
|
/** |
* Update texture-related derived state. |
*/ |
void |
_mesa_update_texture( struct gl_context *ctx, GLuint new_state ) |
{ |
if (new_state & _NEW_TEXTURE_MATRIX) |
update_texture_matrices( ctx ); |
|
if (new_state & (_NEW_TEXTURE | _NEW_PROGRAM)) |
update_texture_state( ctx ); |
} |
|
|
/**********************************************************************/ |
/***** Initialization *****/ |
/**********************************************************************/ |
|
/** |
* Allocate the proxy textures for the given context. |
* |
* \param ctx the context to allocate proxies for. |
* |
* \return GL_TRUE on success, or GL_FALSE on failure |
* |
* If run out of memory part way through the allocations, clean up and return |
* GL_FALSE. |
*/ |
static GLboolean |
alloc_proxy_textures( struct gl_context *ctx ) |
{ |
/* NOTE: these values must be in the same order as the TEXTURE_x_INDEX |
* values! |
*/ |
static const GLenum targets[] = { |
GL_TEXTURE_2D_MULTISAMPLE, |
GL_TEXTURE_2D_MULTISAMPLE_ARRAY, |
GL_TEXTURE_CUBE_MAP_ARRAY, |
GL_TEXTURE_BUFFER, |
GL_TEXTURE_2D_ARRAY_EXT, |
GL_TEXTURE_1D_ARRAY_EXT, |
GL_TEXTURE_EXTERNAL_OES, |
GL_TEXTURE_CUBE_MAP_ARB, |
GL_TEXTURE_3D, |
GL_TEXTURE_RECTANGLE_NV, |
GL_TEXTURE_2D, |
GL_TEXTURE_1D, |
}; |
GLint tgt; |
|
STATIC_ASSERT(ARRAY_SIZE(targets) == NUM_TEXTURE_TARGETS); |
assert(targets[TEXTURE_2D_INDEX] == GL_TEXTURE_2D); |
assert(targets[TEXTURE_CUBE_INDEX] == GL_TEXTURE_CUBE_MAP); |
|
for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) { |
if (!(ctx->Texture.ProxyTex[tgt] |
= ctx->Driver.NewTextureObject(ctx, 0, targets[tgt]))) { |
/* out of memory, free what we did allocate */ |
while (--tgt >= 0) { |
ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]); |
} |
return GL_FALSE; |
} |
} |
|
assert(ctx->Texture.ProxyTex[0]->RefCount == 1); /* sanity check */ |
return GL_TRUE; |
} |
|
|
/** |
* Initialize a texture unit. |
* |
* \param ctx GL context. |
* \param unit texture unit number to be initialized. |
*/ |
static void |
init_texture_unit( struct gl_context *ctx, GLuint unit ) |
{ |
struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; |
GLuint tex; |
|
texUnit->EnvMode = GL_MODULATE; |
ASSIGN_4V( texUnit->EnvColor, 0.0, 0.0, 0.0, 0.0 ); |
|
texUnit->Combine = default_combine_state; |
texUnit->_EnvMode = default_combine_state; |
texUnit->_CurrentCombine = & texUnit->_EnvMode; |
|
texUnit->TexGenEnabled = 0x0; |
texUnit->GenS.Mode = GL_EYE_LINEAR; |
texUnit->GenT.Mode = GL_EYE_LINEAR; |
texUnit->GenR.Mode = GL_EYE_LINEAR; |
texUnit->GenQ.Mode = GL_EYE_LINEAR; |
texUnit->GenS._ModeBit = TEXGEN_EYE_LINEAR; |
texUnit->GenT._ModeBit = TEXGEN_EYE_LINEAR; |
texUnit->GenR._ModeBit = TEXGEN_EYE_LINEAR; |
texUnit->GenQ._ModeBit = TEXGEN_EYE_LINEAR; |
|
/* Yes, these plane coefficients are correct! */ |
ASSIGN_4V( texUnit->GenS.ObjectPlane, 1.0, 0.0, 0.0, 0.0 ); |
ASSIGN_4V( texUnit->GenT.ObjectPlane, 0.0, 1.0, 0.0, 0.0 ); |
ASSIGN_4V( texUnit->GenR.ObjectPlane, 0.0, 0.0, 0.0, 0.0 ); |
ASSIGN_4V( texUnit->GenQ.ObjectPlane, 0.0, 0.0, 0.0, 0.0 ); |
ASSIGN_4V( texUnit->GenS.EyePlane, 1.0, 0.0, 0.0, 0.0 ); |
ASSIGN_4V( texUnit->GenT.EyePlane, 0.0, 1.0, 0.0, 0.0 ); |
ASSIGN_4V( texUnit->GenR.EyePlane, 0.0, 0.0, 0.0, 0.0 ); |
ASSIGN_4V( texUnit->GenQ.EyePlane, 0.0, 0.0, 0.0, 0.0 ); |
|
/* initialize current texture object ptrs to the shared default objects */ |
for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) { |
_mesa_reference_texobj(&texUnit->CurrentTex[tex], |
ctx->Shared->DefaultTex[tex]); |
} |
|
texUnit->_BoundTextures = 0; |
} |
|
|
/** |
* Initialize texture state for the given context. |
*/ |
GLboolean |
_mesa_init_texture(struct gl_context *ctx) |
{ |
GLuint u; |
|
/* Texture group */ |
ctx->Texture.CurrentUnit = 0; /* multitexture */ |
|
/* Appendix F.2 of the OpenGL ES 3.0 spec says: |
* |
* "OpenGL ES 3.0 requires that all cube map filtering be |
* seamless. OpenGL ES 2.0 specified that a single cube map face be |
* selected and used for filtering." |
* |
* Unfortunatley, a call to _mesa_is_gles3 below will only work if |
* the driver has already computed and set ctx->Version, however drivers |
* seem to call _mesa_initialize_context (which calls this) early |
* in the CreateContext hook and _mesa_compute_version much later (since |
* it needs information about available extensions). So, we will |
* enable seamless cubemaps by default since GLES2. This should work |
* for most implementations and drivers that don't support seamless |
* cubemaps for GLES2 can still disable it. |
*/ |
ctx->Texture.CubeMapSeamless = ctx->API == API_OPENGLES2; |
|
for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) |
init_texture_unit(ctx, u); |
|
/* After we're done initializing the context's texture state the default |
* texture objects' refcounts should be at least |
* MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1. |
*/ |
assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount |
>= MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1); |
|
/* Allocate proxy textures */ |
if (!alloc_proxy_textures( ctx )) |
return GL_FALSE; |
|
/* GL_ARB_texture_buffer_object */ |
_mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject, |
ctx->Shared->NullBufferObj); |
|
ctx->Texture.NumCurrentTexUsed = 0; |
|
return GL_TRUE; |
} |
|
|
/** |
* Free dynamically-allocted texture data attached to the given context. |
*/ |
void |
_mesa_free_texture_data(struct gl_context *ctx) |
{ |
GLuint u, tgt; |
|
/* unreference current textures */ |
for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) { |
/* The _Current texture could account for another reference */ |
_mesa_reference_texobj(&ctx->Texture.Unit[u]._Current, NULL); |
|
for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) { |
_mesa_reference_texobj(&ctx->Texture.Unit[u].CurrentTex[tgt], NULL); |
} |
} |
|
/* Free proxy texture objects */ |
for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) |
ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]); |
|
/* GL_ARB_texture_buffer_object */ |
_mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject, NULL); |
|
for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) { |
_mesa_reference_sampler_object(ctx, &ctx->Texture.Unit[u].Sampler, NULL); |
} |
} |
|
|
/** |
* Update the default texture objects in the given context to reference those |
* specified in the shared state and release those referencing the old |
* shared state. |
*/ |
void |
_mesa_update_default_objects_texture(struct gl_context *ctx) |
{ |
GLuint u, tex; |
|
for (u = 0; u < ARRAY_SIZE(ctx->Texture.Unit); u++) { |
struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u]; |
for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) { |
_mesa_reference_texobj(&texUnit->CurrentTex[tex], |
ctx->Shared->DefaultTex[tex]); |
} |
} |
} |