diff options
Diffstat (limited to 'mesalib/src/mesa/state_tracker/st_atom_texture.c')
-rw-r--r-- | mesalib/src/mesa/state_tracker/st_atom_texture.c | 216 |
1 files changed, 143 insertions, 73 deletions
diff --git a/mesalib/src/mesa/state_tracker/st_atom_texture.c b/mesalib/src/mesa/state_tracker/st_atom_texture.c index 75e6face4..c9bffce4f 100644 --- a/mesalib/src/mesa/state_tracker/st_atom_texture.c +++ b/mesalib/src/mesa/state_tracker/st_atom_texture.c @@ -50,91 +50,165 @@ /** - * Combine depth texture mode with "swizzle" so that depth mode swizzling - * takes place before texture swizzling, and return the resulting swizzle. - * If the format is not a depth format, return "swizzle" unchanged. - * - * \param format PIPE_FORMAT_*. - * \param swizzle Texture swizzle, a bitmask computed using MAKE_SWIZZLE4. - * \param depthmode One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA, GL_RED. + * Return swizzle1(swizzle2) */ -static GLuint -apply_depthmode(enum pipe_format format, GLuint swizzle, GLenum depthmode) +static unsigned +swizzle_swizzle(unsigned swizzle1, unsigned swizzle2) { - const struct util_format_description *desc = - util_format_description(format); - unsigned char swiz[4]; - unsigned i; - - if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS || - desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) { - /* Not a depth format. */ - return swizzle; + unsigned i, swz[4]; + + for (i = 0; i < 4; i++) { + unsigned s = GET_SWZ(swizzle1, i); + switch (s) { + case SWIZZLE_X: + case SWIZZLE_Y: + case SWIZZLE_Z: + case SWIZZLE_W: + swz[i] = GET_SWZ(swizzle2, s); + break; + case SWIZZLE_ZERO: + swz[i] = SWIZZLE_ZERO; + break; + case SWIZZLE_ONE: + swz[i] = SWIZZLE_ONE; + break; + default: + assert(!"Bad swizzle term"); + swz[i] = SWIZZLE_X; + } } - for (i = 0; i < 4; i++) - swiz[i] = GET_SWZ(swizzle, i); + return MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]); +} - switch (depthmode) { - case GL_LUMINANCE: - /* Rewrite reads from W to ONE, and reads from XYZ to XXX. */ - for (i = 0; i < 4; i++) - if (swiz[i] == SWIZZLE_W) - swiz[i] = SWIZZLE_ONE; - else if (swiz[i] < SWIZZLE_W) - swiz[i] = SWIZZLE_X; - break; +/** + * Given a user-specified texture base format, the actual gallium texture + * format and the current GL_DEPTH_MODE, return a texture swizzle. + * + * Consider the case where the user requests a GL_RGB internal texture + * format the driver actually uses an RGBA format. The A component should + * be ignored and sampling from the texture should always return (r,g,b,1). + * But if we rendered to the texture we might have written A values != 1. + * By sampling the texture with a ".xyz1" swizzle we'll get the expected A=1. + * This function computes the texture swizzle needed to get the expected + * values. + * + * In the case of depth textures, the GL_DEPTH_MODE state determines the + * texture swizzle. + * + * This result must be composed with the user-specified swizzle to get + * the final swizzle. + */ +static unsigned +compute_texture_format_swizzle(GLenum baseFormat, GLenum depthMode, + enum pipe_format actualFormat) +{ + switch (baseFormat) { + case GL_RGBA: + return SWIZZLE_XYZW; + case GL_RGB: + if (util_format_has_alpha(actualFormat)) + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_ONE); + else + return SWIZZLE_XYZW; + case GL_RG: + if (util_format_get_nr_components(actualFormat) > 2) + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_ZERO, SWIZZLE_ONE); + else + return SWIZZLE_XYZW; + case GL_RED: + if (util_format_get_nr_components(actualFormat) > 1) + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, + SWIZZLE_ZERO, SWIZZLE_ONE); + else + return SWIZZLE_XYZW; + case GL_ALPHA: + if (util_format_get_nr_components(actualFormat) > 1) + return MAKE_SWIZZLE4(SWIZZLE_ZERO, SWIZZLE_ZERO, + SWIZZLE_ZERO, SWIZZLE_W); + else + return SWIZZLE_XYZW; + case GL_LUMINANCE: + if (util_format_get_nr_components(actualFormat) > 1) + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_ONE); + else + return SWIZZLE_XYZW; + case GL_LUMINANCE_ALPHA: + if (util_format_get_nr_components(actualFormat) > 2) + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_W); + else + return SWIZZLE_XYZW; + case GL_INTENSITY: + if (util_format_get_nr_components(actualFormat) > 1) + return SWIZZLE_XXXX; + else + return SWIZZLE_XYZW; + case GL_STENCIL_INDEX: + return SWIZZLE_XYZW; + case GL_DEPTH_STENCIL: + /* fall-through */ + case GL_DEPTH_COMPONENT: + /* Now examine the depth mode */ + switch (depthMode) { + case GL_LUMINANCE: + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_ONE); case GL_INTENSITY: - /* Rewrite reads from XYZW to XXXX. */ - for (i = 0; i < 4; i++) - if (swiz[i] <= SWIZZLE_W) - swiz[i] = SWIZZLE_X; - break; - + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X); case GL_ALPHA: - /* Rewrite reads from W to X, and reads from XYZ to 000. */ - for (i = 0; i < 4; i++) - if (swiz[i] == SWIZZLE_W) - swiz[i] = SWIZZLE_X; - else if (swiz[i] < SWIZZLE_W) - swiz[i] = SWIZZLE_ZERO; - break; + return MAKE_SWIZZLE4(SWIZZLE_ZERO, SWIZZLE_ZERO, + SWIZZLE_ZERO, SWIZZLE_X); case GL_RED: - /* Rewrite reads W to 1, XYZ to X00 */ - for (i = 0; i < 4; i++) - if (swiz[i] == SWIZZLE_W) - swiz[i] = SWIZZLE_ONE; - else if (swiz[i] == SWIZZLE_Y || swiz[i] == SWIZZLE_Z) - swiz[i] = SWIZZLE_ZERO; - break; + return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, + SWIZZLE_ZERO, SWIZZLE_ONE); + default: + assert(!"Unexpected depthMode"); + return SWIZZLE_XYZW; + } + default: + assert(!"Unexpected baseFormat"); + return SWIZZLE_XYZW; } - - return MAKE_SWIZZLE4(swiz[0], swiz[1], swiz[2], swiz[3]); } +static unsigned +get_texture_format_swizzle(const struct st_texture_object *stObj) +{ + const struct gl_texture_image *texImage = + stObj->base.Image[0][stObj->base.BaseLevel]; + unsigned tex_swizzle; + + if (texImage) { + tex_swizzle = compute_texture_format_swizzle(texImage->_BaseFormat, + stObj->base.DepthMode, + stObj->pt->format); + } + else { + tex_swizzle = SWIZZLE_XYZW; + } + + /* Combine the texture format swizzle with user's swizzle */ + return swizzle_swizzle(stObj->base._Swizzle, tex_swizzle); +} + + /** - * Return TRUE if the swizzling described by "swizzle" and - * "depthmode" (for depth textures only) is different from the swizzling - * set in the given sampler view. + * Return TRUE if the texture's sampler view swizzle is equal to + * the texture's swizzle. * - * \param sv A sampler view. - * \param swizzle Texture swizzle, a bitmask computed using MAKE_SWIZZLE4. - * \param depthmode One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA. + * \param stObj the st texture object, */ static boolean -check_sampler_swizzle(struct pipe_sampler_view *sv, - GLuint swizzle, GLenum depthmode) +check_sampler_swizzle(const struct st_texture_object *stObj) { - swizzle = apply_depthmode(sv->texture->format, swizzle, depthmode); - - if ((sv->swizzle_r != GET_SWZ(swizzle, 0)) || - (sv->swizzle_g != GET_SWZ(swizzle, 1)) || - (sv->swizzle_b != GET_SWZ(swizzle, 2)) || - (sv->swizzle_a != GET_SWZ(swizzle, 3))) - return TRUE; - return FALSE; + const struct pipe_sampler_view *sv = stObj->sampler_view; + unsigned swizzle = get_texture_format_swizzle(stObj); + + return ((sv->swizzle_r != GET_SWZ(swizzle, 0)) || + (sv->swizzle_g != GET_SWZ(swizzle, 1)) || + (sv->swizzle_b != GET_SWZ(swizzle, 2)) || + (sv->swizzle_a != GET_SWZ(swizzle, 3))); } @@ -145,9 +219,7 @@ st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe, enum pipe_format format) { struct pipe_sampler_view templ; - GLuint swizzle = apply_depthmode(stObj->pt->format, - stObj->base._Swizzle, - stObj->base.DepthMode); + unsigned swizzle = get_texture_format_swizzle(stObj); u_sampler_view_default_template(&templ, stObj->pt, @@ -260,9 +332,7 @@ update_single_texture(struct st_context *st, /* if sampler view has changed dereference it */ if (stObj->sampler_view) { - if (check_sampler_swizzle(stObj->sampler_view, - stObj->base._Swizzle, - stObj->base.DepthMode) || + if (check_sampler_swizzle(stObj) || (view_format != stObj->sampler_view->format) || stObj->base.BaseLevel != stObj->sampler_view->u.tex.first_level) { pipe_sampler_view_release(pipe, &stObj->sampler_view); 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