From 3c19251f28e6b4feff81f48b1c73f1f2e09e38e1 Mon Sep 17 00:00:00 2001 From: Iago Toral Quiroga Date: Wed, 26 Nov 2014 10:38:44 +0100 Subject: mesa: Let _mesa_get_format_base_format also handle mesa_array_format. If we need the base format for a mesa_array_format we have to find the matching mesa_format first. This is expensive because it requires to loop through all existing mesa formats until we find the right match. We can resolve the base format of an array format directly by looking at its swizzle information. Also, we can have _mesa_get_format_base_format accept an uint32_t which can pack either a mesa_format or a mesa_array_format and resolve the base format for either type. This way clients do not need to check if they have a mesa_format or a mesa_array_format and call different functions depending on the case. Another reason to resolve the base format for array formats directly is that we don't have matching mesa_format enums for every possible array format, so for some GL format/type combinations we can produce array formats that don't have a corresponding mesa format, in which case we would not be able to find the base format. Example format=GL_RGB, type=GL_UNSIGNED_SHORT. This type would map to something like MESA_FORMAT_RGB_UNORM16, but we don't have that. Reviewed-by: Jason Ekstrand --- src/mesa/main/formats.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++-- src/mesa/main/formats.h | 2 +- 2 files changed, 74 insertions(+), 4 deletions(-) diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c index 125989254aa..b10b628235c 100644 --- a/src/mesa/main/formats.c +++ b/src/mesa/main/formats.c @@ -214,17 +214,87 @@ _mesa_get_format_datatype(mesa_format format) return info->DataType; } +static GLenum +get_base_format_for_array_format(mesa_array_format format) +{ + uint8_t swizzle[4]; + int num_channels; + + _mesa_array_format_get_swizzle(format, swizzle); + num_channels = _mesa_array_format_get_num_channels(format); + + switch (num_channels) { + case 4: + /* FIXME: RGBX formats have 4 channels, but their base format is GL_RGB. + * This is not really a problem for now because we only create array + * formats from GL format/type combinations, and these cannot specify + * RGBX formats. + */ + return GL_RGBA; + case 3: + return GL_RGB; + case 2: + if (swizzle[0] == 0 && + swizzle[1] == 0 && + swizzle[2] == 0 && + swizzle[3] == 1) + return GL_LUMINANCE_ALPHA; + if (swizzle[0] == 1 && + swizzle[1] == 1 && + swizzle[2] == 1 && + swizzle[3] == 0) + return GL_LUMINANCE_ALPHA; + if (swizzle[0] == 0 && + swizzle[1] == 1 && + swizzle[2] == 4 && + swizzle[3] == 5) + return GL_RG; + if (swizzle[0] == 1 && + swizzle[1] == 0 && + swizzle[2] == 4 && + swizzle[3] == 5) + return GL_RG; + break; + case 1: + if (swizzle[0] == 0 && + swizzle[1] == 0 && + swizzle[2] == 0 && + swizzle[3] == 5) + return GL_LUMINANCE; + if (swizzle[0] == 0 && + swizzle[1] == 0 && + swizzle[2] == 0 && + swizzle[3] == 0) + return GL_INTENSITY; + if (swizzle[0] <= MESA_FORMAT_SWIZZLE_W) + return GL_RED; + if (swizzle[1] <= MESA_FORMAT_SWIZZLE_W) + return GL_GREEN; + if (swizzle[2] <= MESA_FORMAT_SWIZZLE_W) + return GL_BLUE; + if (swizzle[3] <= MESA_FORMAT_SWIZZLE_W) + return GL_ALPHA; + break; + } + + unreachable("Unsupported format"); +} /** * Return the basic format for the given type. The result will be one of * GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY, * GL_YCBCR_MESA, GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL. + * This functions accepts a mesa_format or a mesa_array_format. */ GLenum -_mesa_get_format_base_format(mesa_format format) +_mesa_get_format_base_format(uint32_t format) { - const struct gl_format_info *info = _mesa_get_format_info(format); - return info->BaseFormat; + if (!_mesa_format_is_mesa_array_format(format)) { + const struct gl_format_info *info = _mesa_get_format_info(format); + return info->BaseFormat; + } else { + return get_base_format_for_array_format(format); + } } diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h index 8656c01d2d8..dd07c35f5d9 100644 --- a/src/mesa/main/formats.h +++ b/src/mesa/main/formats.h @@ -587,7 +587,7 @@ extern GLenum _mesa_get_format_datatype(mesa_format format); extern GLenum -_mesa_get_format_base_format(mesa_format format); +_mesa_get_format_base_format(uint32_t format); extern void _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh); -- cgit v1.2.3