diff options
Diffstat (limited to 'mesalib/src/mesa/main/texstate.c')
| -rw-r--r-- | mesalib/src/mesa/main/texstate.c | 823 |
1 files changed, 823 insertions, 0 deletions
diff --git a/mesalib/src/mesa/main/texstate.c b/mesalib/src/mesa/main/texstate.c new file mode 100644 index 000000000..861c5f37c --- /dev/null +++ b/mesalib/src/mesa/main/texstate.c @@ -0,0 +1,823 @@ +/* + * Mesa 3-D graphics library + * Version: 7.5 + * + * 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 + * BRIAN PAUL 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 "glheader.h" +#include "mfeatures.h" +#include "colormac.h" +#if FEATURE_colortable +#include "colortab.h" +#endif +#include "context.h" +#include "enums.h" +#include "macros.h" +#include "texcompress.h" +#include "texobj.h" +#include "teximage.h" +#include "texstate.h" +#include "texenvprogram.h" +#include "mtypes.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 GLcontext *src, GLcontext *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; + dst->Texture.SharedPalette = src->Texture.SharedPalette; + + /* per-unit state */ + for (u = 0; u < src->Const.MaxTextureImageUnits; 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; + + /* GL_ATI_envmap_bumpmap - need this? */ + dst->Texture.Unit[u].BumpTarget = src->Texture.Unit[u].BumpTarget; + COPY_4V(dst->Texture.Unit[u].RotMatrix, src->Texture.Unit[u].RotMatrix); + + + /* 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]); + } + + _mesa_unlock_context_textures(dst); + } +} + + +/* + * For debugging + */ +void +_mesa_print_texunit_state( GLcontext *ctx, GLuint unit ) +{ + const struct gl_texture_unit *texUnit = ctx->Texture.Unit + unit; + _mesa_printf("Texture Unit %d\n", unit); + _mesa_printf(" GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit->EnvMode)); + _mesa_printf(" GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeRGB)); + _mesa_printf(" GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeA)); + _mesa_printf(" GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[0])); + _mesa_printf(" GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[1])); + _mesa_printf(" GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[2])); + _mesa_printf(" GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[0])); + _mesa_printf(" GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[1])); + _mesa_printf(" GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[2])); + _mesa_printf(" GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[0])); + _mesa_printf(" GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[1])); + _mesa_printf(" GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[2])); + _mesa_printf(" GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[0])); + _mesa_printf(" GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[1])); + _mesa_printf(" GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[2])); + _mesa_printf(" GL_RGB_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftRGB); + _mesa_printf(" GL_ALPHA_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftA); + _mesa_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_RGB: + case GL_YCBCR_MESA: + case GL_DUDV_ATI: + 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_RGB: + case GL_YCBCR_MESA: + case GL_DUDV_ATI: + 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_RGB: + case GL_LUMINANCE_ALPHA: + case GL_RGBA: + case GL_YCBCR_MESA: + case GL_DUDV_ATI: + 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_ActiveTextureARB(GLenum texture) +{ + GET_CURRENT_CONTEXT(ctx); + const GLuint texUnit = texture - GL_TEXTURE0; + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) + _mesa_debug(ctx, "glActiveTexture %s\n", + _mesa_lookup_enum_by_nr(texture)); + + if (texUnit >= ctx->Const.MaxTextureImageUnits) { + _mesa_error(ctx, GL_INVALID_ENUM, "glActiveTexture(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]; + } + + if (ctx->Driver.ActiveTexture) { + (*ctx->Driver.ActiveTexture)( ctx, (GLuint) texUnit ); + } +} + + +/* GL_ARB_multitexture */ +void GLAPIENTRY +_mesa_ClientActiveTextureARB(GLenum texture) +{ + GET_CURRENT_CONTEXT(ctx); + GLuint texUnit = texture - GL_TEXTURE0; + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (texUnit >= ctx->Const.MaxTextureCoordUnits) { + _mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture)"); + 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( GLcontext *ctx ) +{ + GLuint u; + + ctx->Texture._TexMatEnabled = 0x0; + + for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) { + if (_math_matrix_is_dirty(ctx->TextureMatrixStack[u].Top)) { + _math_matrix_analyse( ctx->TextureMatrixStack[u].Top ); + + if (ctx->Texture.Unit[u]._ReallyEnabled && + ctx->TextureMatrixStack[u].Top->type != MATRIX_IDENTITY) + ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(u); + + if (ctx->Driver.TextureMatrix) + ctx->Driver.TextureMatrix( ctx, u, ctx->TextureMatrixStack[u].Top); + } + } +} + + +/** + * Examine texture unit's combine/env state to update derived state. + */ +static void +update_tex_combine(GLcontext *ctx, struct gl_texture_unit *texUnit) +{ + struct gl_tex_env_combine_state *combine; + + /* 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_COLOR_INDEX) { + format = GL_RGBA; /* a bit of a hack */ + } + else 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; + case GL_BUMP_ENVMAP_ATI: + /* no real arguments for this case */ + combine->_NumArgsRGB = 0; + 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; + } +} + + +/** + * \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( GLcontext *ctx ) +{ + GLuint unit; + struct gl_fragment_program *fprog = NULL; + struct gl_vertex_program *vprog = NULL; + GLbitfield enabledFragUnits = 0x0; + + if (ctx->Shader.CurrentProgram && + ctx->Shader.CurrentProgram->LinkStatus) { + fprog = ctx->Shader.CurrentProgram->FragmentProgram; + vprog = ctx->Shader.CurrentProgram->VertexProgram; + } + else { + if (ctx->FragmentProgram._Enabled) { + fprog = ctx->FragmentProgram.Current; + } + if (ctx->VertexProgram._Enabled) { + /* XXX enable this if/when non-shader vertex programs get + * texture fetches: + vprog = ctx->VertexProgram.Current; + */ + } + } + + /* TODO: only set this if there are actual changes */ + ctx->NewState |= _NEW_TEXTURE; + + ctx->Texture._EnabledUnits = 0x0; + ctx->Texture._GenFlags = 0x0; + ctx->Texture._TexMatEnabled = 0x0; + ctx->Texture._TexGenEnabled = 0x0; + + /* + * Update texture unit state. + */ + for (unit = 0; unit < ctx->Const.MaxTextureImageUnits; unit++) { + struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; + GLbitfield enabledVertTargets = 0x0; + GLbitfield enabledFragTargets = 0x0; + GLbitfield enabledTargets = 0x0; + GLuint texIndex; + + /* Get the bitmask of texture target enables. + * enableBits will be a mask of the TEXTURE_*_BIT flags indicating + * which texture targets are enabled (fixed function) or referenced + * by a fragment shader/program. When multiple flags are set, we'll + * settle on the one with highest priority (see below). + */ + if (vprog) { + enabledVertTargets |= vprog->Base.TexturesUsed[unit]; + } + + if (fprog) { + enabledFragTargets |= fprog->Base.TexturesUsed[unit]; + } + else { + /* fixed-function fragment program */ + enabledFragTargets |= texUnit->Enabled; + } + + enabledTargets = enabledVertTargets | enabledFragTargets; + + texUnit->_ReallyEnabled = 0x0; + + if (enabledTargets == 0x0) { + /* neither vertex nor fragment processing uses this unit */ + continue; + } + + /* Look for the highest priority texture target that's enabled (or used + * by the vert/frag shaders) and "complete". That's the one we'll use + * for texturing. If we're using vert/frag program we're guaranteed + * that bitcount(enabledBits) <= 1. + * Note that the TEXTURE_x_INDEX values are in high to low priority. + */ + for (texIndex = 0; texIndex < NUM_TEXTURE_TARGETS; texIndex++) { + if (enabledTargets & (1 << texIndex)) { + struct gl_texture_object *texObj = texUnit->CurrentTex[texIndex]; + if (!texObj->_Complete) { + _mesa_test_texobj_completeness(ctx, texObj); + } + if (texObj->_Complete) { + texUnit->_ReallyEnabled = 1 << texIndex; + _mesa_reference_texobj(&texUnit->_Current, texObj); + break; + } + } + } + + if (!texUnit->_ReallyEnabled) { + if (fprog) { + /* If we get here it means the shader is expecting a texture + * object, but there isn't one (or it's incomplete). Use the + * fallback texture. + */ + struct gl_texture_object *texObj = _mesa_get_fallback_texture(ctx); + texUnit->_ReallyEnabled = 1 << TEXTURE_2D_INDEX; + _mesa_reference_texobj(&texUnit->_Current, texObj); + } + else { + /* fixed-function: texture unit is really disabled */ + continue; + } + } + + /* if we get here, we know this texture unit is enabled */ + + ctx->Texture._EnabledUnits |= (1 << unit); + + if (enabledFragTargets) + enabledFragUnits |= (1 << unit); + + update_tex_combine(ctx, texUnit); + } + + + /* Determine which texture coordinate sets are actually needed */ + if (fprog) { + const GLuint coordMask = (1 << MAX_TEXTURE_COORD_UNITS) - 1; + ctx->Texture._EnabledCoordUnits + = (fprog->Base.InputsRead >> FRAG_ATTRIB_TEX0) & coordMask; + } + else { + ctx->Texture._EnabledCoordUnits = enabledFragUnits; + } + + /* 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; + } + + if (ctx->TextureMatrixStack[unit].Top->type != MATRIX_IDENTITY) + ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(unit); + } +} + + +/** + * Update texture-related derived state. + */ +void +_mesa_update_texture( GLcontext *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( GLcontext *ctx ) +{ + static const GLenum targets[] = { + GL_TEXTURE_1D, + GL_TEXTURE_2D, + GL_TEXTURE_3D, + GL_TEXTURE_CUBE_MAP_ARB, + GL_TEXTURE_RECTANGLE_NV, + GL_TEXTURE_1D_ARRAY_EXT, + GL_TEXTURE_2D_ARRAY_EXT + }; + GLint tgt; + + ASSERT(Elements(targets) == NUM_TEXTURE_TARGETS); + + 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( GLcontext *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->BumpTarget = GL_TEXTURE0; + + 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 ); + + /* no mention of this in spec, but maybe id matrix expected? */ + ASSIGN_4V( texUnit->RotMatrix, 1.0, 0.0, 0.0, 1.0 ); + + /* 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]); + } +} + + +/** + * Initialize texture state for the given context. + */ +GLboolean +_mesa_init_texture(GLcontext *ctx) +{ + GLuint u; + + /* Texture group */ + ctx->Texture.CurrentUnit = 0; /* multitexture */ + ctx->Texture._EnabledUnits = 0x0; + ctx->Texture.SharedPalette = GL_FALSE; +#if FEATURE_colortable + _mesa_init_colortable(&ctx->Texture.Palette); +#endif + + for (u = 0; u < MAX_TEXTURE_UNITS; 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_TEXTURE_UNITS + 1. + */ + assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount + >= MAX_TEXTURE_UNITS + 1); + + /* Allocate proxy textures */ + if (!alloc_proxy_textures( ctx )) + return GL_FALSE; + + return GL_TRUE; +} + + +/** + * Free dynamically-allocted texture data attached to the given context. + */ +void +_mesa_free_texture_data(GLcontext *ctx) +{ + GLuint u, tgt; + + /* unreference current textures */ + for (u = 0; u < MAX_TEXTURE_IMAGE_UNITS; 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]); + +#if FEATURE_colortable + for (u = 0; u < MAX_TEXTURE_IMAGE_UNITS; u++) + _mesa_free_colortable_data(&ctx->Texture.Unit[u].ColorTable); +#endif +} + + +/** + * 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(GLcontext *ctx) +{ + GLuint u, tex; + + for (u = 0; u < MAX_TEXTURE_UNITS; 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]); + } + } +} |