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GL_ARB_sampler_objects provides a GL object which overrides the sampler state part of a texture object with different values. The sampler state that Cogl currently exposes is the wrap modes and filters. Cogl exposes the state as part of the pipeline layer state but without this extension GL only exposes it as part of the texture object state. This means that it won't work to use a single texture multiple times in one primitive with different sampler states. It also makes switching between different sampler states with a single texture not terribly efficient because it has to change the texture object state every time. This patch adds a cache for sampler states in a shared hash table attached to the CoglContext. The entire set of parameters for the sampler state is used as the key for the hash table. When a unique state is encountered the sampler cache will create a new entry, otherwise it will return a const pointer to an existing entry. That means we can have a single pointer to represent any combination of sampler state. Pipeline layers now just store this single pointer rather than storing all of the sampler state. The two separate state flags for wrap modes and filters have now been combined into one. It should be faster to compare the sampler state now because instead of comparing each value it can just compare the pointers to the cached sampler entries. The hash table of cached sampler states should only need to perform its more expensive hash on the state when a property is changed on a pipeline, not every time it is flushed. When the sampler objects extension is available each cached sampler state will also get a sampler object to represent it. The common code to flush the GL state will now simply bind this object to a unit instead of flushing the state though the CoglTexture when possible. Reviewed-by: Robert Bragg <robert@linux.intel.com>
232 lines
8.6 KiB
C
232 lines
8.6 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) 2009, 2011 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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/* This is included multiple times with different definitions for
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* these macros. The macros are given the following arguments:
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*
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* COGL_EXT_BEGIN:
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*
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* @name: a unique symbol name for this feature
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*
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* @min_gl_major: the major part of the minimum GL version where these
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* functions are available in core, or 255 if it isn't available in
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* any version.
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* @min_gl_minor: the minor part of the minimum GL version where these
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* functions are available in core, or 255 if it isn't available in
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* any version.
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*
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* @gles_availability: flags to specify which versions of GLES the
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* functions are available in. Should be a combination of
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* COGL_EXT_IN_GLES and COGL_EXT_IN_GLES2.
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*
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* @extension_suffixes: A zero-separated list of suffixes in a
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* string. These are appended to the extension name to get a complete
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* extension name to try. The suffix is also appended to all of the
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* function names. The suffix can optionally include a ':' to specify
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* an alternate suffix for the function names.
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*
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* @extension_names: A list of extension names to try. If any of these
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* extensions match then it will be used.
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*/
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/* The functions in this file are part of the core GL,GLES1 and GLES2 apis */
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#include "cogl-core-functions.h"
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/* The functions in this file are core to GLES1 only but may also be
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* extensions available for GLES2 and GL */
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#include "cogl-in-gles1-core-functions.h"
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/* The functions in this file are core to GLES2 only but
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* may be extensions for GLES1 and GL */
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#include "cogl-in-gles2-core-functions.h"
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/* The functions in this file are core to GLES1 and GLES2 but not core
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* to GL but they may be extensions available for GL */
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#include "cogl-in-gles-core-functions.h"
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/* These are fixed-function APIs core to GL and GLES1 */
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#include "cogl-fixed-functions.h"
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/* These are GLSL shader APIs core to GL 2.0 and GLES2 */
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#include "cogl-glsl-functions.h"
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/* These are the core GL functions which are only available in big
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GL */
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COGL_EXT_BEGIN (only_in_big_gl,
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0, 0,
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0, /* not in GLES */
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"\0",
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"\0")
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COGL_EXT_FUNCTION (void, glGetTexLevelParameteriv,
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(GLenum target, GLint level,
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GLenum pname, GLint *params))
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COGL_EXT_FUNCTION (void, glGetTexImage,
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(GLenum target, GLint level,
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GLenum format, GLenum type,
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GLvoid *pixels))
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COGL_EXT_FUNCTION (void, glClipPlane,
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(GLenum plane, const double *equation))
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COGL_EXT_FUNCTION (void, glDepthRange,
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(double near_val, double far_val))
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COGL_EXT_FUNCTION (void, glDrawBuffer,
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(GLenum mode))
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COGL_EXT_END ()
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/* GLES doesn't support mapping buffers in core so this has to be a
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separate check */
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COGL_EXT_BEGIN (map_vbos, 1, 5,
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0, /* not in GLES core */
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"ARB\0OES\0",
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"vertex_buffer_object\0mapbuffer\0")
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COGL_EXT_FUNCTION (void *, glMapBuffer,
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(GLenum target,
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GLenum access))
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COGL_EXT_FUNCTION (GLboolean, glUnmapBuffer,
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(GLenum target))
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COGL_EXT_END ()
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COGL_EXT_BEGIN (texture_3d, 1, 2,
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0, /* not in either GLES */
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"OES\0",
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"texture_3D\0")
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COGL_EXT_FUNCTION (void, glTexImage3D,
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(GLenum target, GLint level,
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GLint internalFormat,
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GLsizei width, GLsizei height,
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GLsizei depth, GLint border,
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GLenum format, GLenum type,
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const GLvoid *pixels))
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COGL_EXT_FUNCTION (void, glTexSubImage3D,
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(GLenum target, GLint level,
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GLint xoffset, GLint yoffset,
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GLint zoffset, GLsizei width,
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GLsizei height, GLsizei depth,
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GLenum format,
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GLenum type, const GLvoid *pixels))
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COGL_EXT_END ()
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COGL_EXT_BEGIN (offscreen_blit, 255, 255,
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0, /* not in either GLES */
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"EXT\0ANGLE\0",
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"framebuffer_blit\0")
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COGL_EXT_FUNCTION (void, glBlitFramebuffer,
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(GLint srcX0,
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GLint srcY0,
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GLint srcX1,
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GLint srcY1,
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GLint dstX0,
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GLint dstY0,
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GLint dstX1,
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GLint dstY1,
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GLbitfield mask,
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GLenum filter))
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COGL_EXT_END ()
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/* ARB_fragment_program */
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COGL_EXT_BEGIN (arbfp, 255, 255,
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0, /* not in either GLES */
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"ARB\0",
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"fragment_program\0")
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COGL_EXT_FUNCTION (void, glGenPrograms,
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(GLsizei n,
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GLuint *programs))
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COGL_EXT_FUNCTION (void, glDeletePrograms,
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(GLsizei n,
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GLuint *programs))
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COGL_EXT_FUNCTION (void, glBindProgram,
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(GLenum target,
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GLuint program))
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COGL_EXT_FUNCTION (void, glProgramString,
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(GLenum target,
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GLenum format,
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GLsizei len,
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const void *program))
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COGL_EXT_FUNCTION (void, glProgramLocalParameter4fv,
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(GLenum target,
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GLuint index,
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GLfloat *params))
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COGL_EXT_END ()
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COGL_EXT_BEGIN (EGL_image, 255, 255,
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0, /* not in either GLES */
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"OES\0",
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"EGL_image\0")
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COGL_EXT_FUNCTION (void, glEGLImageTargetTexture2D,
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(GLenum target,
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GLeglImageOES image))
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COGL_EXT_FUNCTION (void, glEGLImageTargetRenderbufferStorage,
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(GLenum target,
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GLeglImageOES image))
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COGL_EXT_END ()
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COGL_EXT_BEGIN (framebuffer_discard, 255, 255,
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0, /* not in either GLES */
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"EXT\0",
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"framebuffer_discard\0")
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COGL_EXT_FUNCTION (void, glDiscardFramebuffer,
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(GLenum target,
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GLsizei numAttachments,
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const GLenum *attachments))
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COGL_EXT_END ()
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COGL_EXT_BEGIN (IMG_multisampled_render_to_texture, 255, 255,
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0, /* not in either GLES */
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"\0",
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"IMG_multisampled_render_to_texture\0")
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COGL_EXT_FUNCTION (void, glRenderbufferStorageMultisampleIMG,
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(GLenum target,
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GLsizei samples,
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GLenum internal_format,
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GLsizei width,
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GLsizei height))
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COGL_EXT_FUNCTION (void, glFramebufferTexture2DMultisampleIMG,
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(GLenum target,
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GLenum attachment,
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GLenum textarget,
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GLuint texture,
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GLint level,
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GLsizei samples))
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COGL_EXT_END ()
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COGL_EXT_BEGIN (ARB_sampler_objects, 255, 255,
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0, /* not in either GLES */
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"ARB:\0",
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"sampler_objects\0")
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COGL_EXT_FUNCTION (void, glGenSamplers,
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(GLsizei count,
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GLuint *samplers))
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COGL_EXT_FUNCTION (void, glDeleteSamplers,
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(GLsizei count,
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const GLuint *samplers))
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COGL_EXT_FUNCTION (void, glBindSampler,
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(GLuint unit,
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GLuint sampler))
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COGL_EXT_FUNCTION (void, glSamplerParameteri,
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(GLuint sampler,
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GLenum pname,
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GLint param))
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COGL_EXT_END ()
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