diff options
| -rw-r--r-- | src/mesa/main/mtypes.h | 3 | ||||
| -rw-r--r-- | src/mesa/main/texobj.c | 53 | ||||
| -rw-r--r-- | src/mesa/main/texobj.h | 3 | ||||
| -rw-r--r-- | src/mesa/main/texstate.c | 9 |
4 files changed, 66 insertions, 2 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h index 30c7cca3b5a..38c3b1bb40d 100644 --- a/src/mesa/main/mtypes.h +++ b/src/mesa/main/mtypes.h @@ -2050,6 +2050,9 @@ struct gl_shared_state /** Default texture objects (shared by all texture units) */ struct gl_texture_object *DefaultTex[NUM_TEXTURE_TARGETS]; + /** Fallback texture used when a bound texture is incomplete */ + struct gl_texture_object *FallbackTex; + /** * \name Thread safety and statechange notification for texture * objects. diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c index b63f747fe8d..0024efc0e64 100644 --- a/src/mesa/main/texobj.c +++ b/src/mesa/main/texobj.c @@ -662,6 +662,59 @@ _mesa_test_texobj_completeness( const GLcontext *ctx, } } + +/** + * Return pointer to a default/fallback texture. + * The texture is a 2D 8x8 RGBA texture with all texels = (0,0,0,1). + * That's the value a sampler should get when sampling from an + * incomplete texture. + */ +struct gl_texture_object * +_mesa_get_fallback_texture(GLcontext *ctx) +{ + if (!ctx->Shared->FallbackTex) { + /* create fallback texture now */ + static GLubyte texels[8 * 8][4]; + struct gl_texture_object *texObj; + struct gl_texture_image *texImage; + GLuint i; + + for (i = 0; i < 8 * 8; i++) { + texels[i][0] = + texels[i][1] = + texels[i][2] = 0x0; + texels[i][3] = 0xff; + } + + /* create texture object */ + texObj = ctx->Driver.NewTextureObject(ctx, 0, GL_TEXTURE_2D); + assert(texObj->RefCount == 1); + texObj->MinFilter = GL_NEAREST; + texObj->MagFilter = GL_NEAREST; + + /* create level[0] texture image */ + texImage = _mesa_get_tex_image(ctx, texObj, GL_TEXTURE_2D, 0); + + /* init the image fields */ + _mesa_init_teximage_fields(ctx, GL_TEXTURE_2D, texImage, + 8, 8, 1, 0, GL_RGBA); + + /* set image data */ + ctx->Driver.TexImage2D(ctx, GL_TEXTURE_2D, 0, GL_RGBA, + 8, 8, 0, + GL_RGBA, GL_UNSIGNED_BYTE, texels, + &ctx->DefaultPacking, texObj, texImage); + + _mesa_test_texobj_completeness(ctx, texObj); + assert(texObj->_Complete); + + ctx->Shared->FallbackTex = texObj; + } + return ctx->Shared->FallbackTex; +} + + + /*@}*/ diff --git a/src/mesa/main/texobj.h b/src/mesa/main/texobj.h index d5374c5d6c4..2599c0816a9 100644 --- a/src/mesa/main/texobj.h +++ b/src/mesa/main/texobj.h @@ -65,6 +65,9 @@ extern void _mesa_test_texobj_completeness( const GLcontext *ctx, struct gl_texture_object *obj ); +extern struct gl_texture_object * +_mesa_get_fallback_texture(GLcontext *ctx); + extern void _mesa_unlock_context_textures( GLcontext *ctx ); diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c index 73f8a5339ec..32d55ba8d58 100644 --- a/src/mesa/main/texstate.c +++ b/src/mesa/main/texstate.c @@ -561,8 +561,13 @@ update_texture_state( GLcontext *ctx ) } if (!texUnit->_ReallyEnabled) { - _mesa_reference_texobj(&texUnit->_Current, NULL); - continue; + /* If we get here it means the shader (or fixed-function state) + * 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); } /* if we get here, we know this texture unit is enabled */ |