520ccba49d
Previously when the context was initialised Cogl would query the number of stencil bits and set a private feature flag to mark that it can use the buffer for clipping if there was at least 3. The problem with this is that the number of stencil bits returned by GL_STENCIL_BITS depends on the currently bound framebuffer. This patch adds an internal function to query the number of stencil bits in a framebuffer and makes it use that instead when determining whether it can push the clip using the stencil buffer. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit e928d21516a6c07798655341f4f0f8e3c1d1686c)
144 lines
4.7 KiB
C
144 lines
4.7 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_PRIVATE_H__
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#define __COGL_PRIVATE_H__
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#include <cogl/cogl-pipeline.h>
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#include "cogl-context.h"
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COGL_BEGIN_DECLS
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typedef enum
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{
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COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE = 1L<<0,
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COGL_PRIVATE_FEATURE_MESA_PACK_INVERT = 1L<<1,
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COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT = 1L<<2,
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COGL_PRIVATE_FEATURE_FOUR_CLIP_PLANES = 1L<<3,
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COGL_PRIVATE_FEATURE_PBOS = 1L<<4,
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COGL_PRIVATE_FEATURE_VBOS = 1L<<5,
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COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL = 1L<<6,
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COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL = 1L<<7,
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COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888 = 1L<<8,
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COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE = 1L<<9,
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COGL_PRIVATE_FEATURE_SAMPLER_OBJECTS = 1L<<10,
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COGL_PRIVATE_FEATURE_FIXED_FUNCTION = 1L<<11,
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COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT = 1L<<12,
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COGL_PRIVATE_FEATURE_ANY_GL = 1L<<13,
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COGL_PRIVATE_FEATURE_ALPHA_TEST = 1L<<14,
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COGL_PRIVATE_FEATURE_FORMAT_CONVERSION = 1L<<15,
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COGL_PRIVATE_FEATURE_QUADS = 1L<<16,
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COGL_PRIVATE_FEATURE_BLEND_CONSTANT = 1L<<17,
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COGL_PRIVATE_FEATURE_QUERY_FRAMEBUFFER_BITS = 1L<<18,
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COGL_PRIVATE_FEATURE_BUILTIN_POINT_SIZE_UNIFORM = 1L<<19,
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COGL_PRIVATE_FEATURE_QUERY_TEXTURE_PARAMETERS = 1L<<20,
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COGL_PRIVATE_FEATURE_ALPHA_TEXTURES = 1L<<21,
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COGL_PRIVATE_FEATURE_TEXTURE_SWIZZLE = 1L<<22
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} CoglPrivateFeatureFlags;
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/* Sometimes when evaluating pipelines, either during comparisons or
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* if calculating a hash value we need to tweak the evaluation
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* semantics */
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typedef enum _CoglPipelineEvalFlags
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{
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COGL_PIPELINE_EVAL_FLAG_NONE = 0
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} CoglPipelineEvalFlags;
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void
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_cogl_transform_point (const CoglMatrix *matrix_mv,
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const CoglMatrix *matrix_p,
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const float *viewport,
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float *x,
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float *y);
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CoglBool
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_cogl_check_extension (const char *name, char * const *ext);
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void
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_cogl_clear (const CoglColor *color, unsigned long buffers);
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void
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_cogl_init (void);
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void
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_cogl_push_source (CoglPipeline *pipeline, CoglBool enable_legacy);
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CoglBool
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_cogl_get_enable_legacy_state (void);
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/*
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* _cogl_pixel_format_get_bytes_per_pixel:
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* @format: a #CoglPixelFormat
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*
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* Queries how many bytes a pixel of the given @format takes.
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*
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* Return value: The number of bytes taken for a pixel of the given
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* @format.
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*/
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int
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_cogl_pixel_format_get_bytes_per_pixel (CoglPixelFormat format);
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/*
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* _cogl_pixel_format_has_aligned_components:
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* @format: a #CoglPixelFormat
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*
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* Queries whether the ordering of the components for the given
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* @format depend on the endianness of the host CPU or if the
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* components can be accessed using bit shifting and bitmasking by
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* loading a whole pixel into a word.
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*
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* XXX: If we ever consider making something like this public we
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* should really try to think of a better name and come up with
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* much clearer documentation since it really depends on what
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* point of view you consider this from whether a format like
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* COGL_PIXEL_FORMAT_RGBA_8888 is endian dependent. E.g. If you
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* read an RGBA_8888 pixel into a uint32
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* it's endian dependent how you mask out the different channels.
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* But If you already have separate color components and you want
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* to write them to an RGBA_8888 pixel then the bytes can be
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* written sequentially regardless of the endianness.
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*
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* Return value: %TRUE if you need to consider the host CPU
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* endianness when dealing with the given @format
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* else %FALSE.
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*/
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CoglBool
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_cogl_pixel_format_is_endian_dependant (CoglPixelFormat format);
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/*
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* COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT(format):
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* @format: a #CoglPixelFormat
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*
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* Returns TRUE if the pixel format can take a premult bit. This is
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* currently true for all formats that have an alpha channel except
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* COGL_PIXEL_FORMAT_A_8 (because that doesn't have any other
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* components to multiply by the alpha).
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*/
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#define COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT(format) \
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(((format) & COGL_A_BIT) && (format) != COGL_PIXEL_FORMAT_A_8)
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COGL_END_DECLS
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#endif /* __COGL_PRIVATE_H__ */
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