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mutter/clutter/cogl/gles/cogl-gles2-wrapper.h
Robert Bragg 33994caa71 [cogl-material] Support string based blending and layer combine descriptions 
Setting up layer combine functions and blend modes is very awkward to do
programatically.  This adds a parser for string based descriptions which are
more consise and readable.

E.g. a material layer combine function could now be given as:
  "RGBA = ADD (TEXTURE[A], PREVIOUS[RGB])"
or
  "RGB = REPLACE (PREVIOUS)"
  "A = MODULATE (PREVIOUS, TEXTURE)"

The simple syntax and grammar are only designed to expose standard fixed
function hardware, more advanced combining must be done with shaders.

This includes standalone documentation of blend strings covering the aspects
that are common to blending and texture combining, and adds documentation
with examples specific to the new cogl_material_set_blend() and
cogl_material_layer_set_combine() functions.

Note: The hope is to remove the now redundant bits of the material API
before 1.0
2009-05-28 02:43:28 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2008,2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __COGL_GLES2_WRAPPER_H__
#define __COGL_GLES2_WRAPPER_H__
#include "cogl-internal.h"
G_BEGIN_DECLS
#ifdef HAVE_COGL_GLES2
typedef struct _CoglGles2Wrapper CoglGles2Wrapper;
typedef struct _CoglGles2WrapperTextureUnit
CoglGles2WrapperTextureUnit;
typedef struct _CoglGles2WrapperAttributes CoglGles2WrapperAttributes;
typedef struct _CoglGles2WrapperUniforms CoglGles2WrapperUniforms;
typedef struct _CoglGles2WrapperTextureUnitSettings
CoglGles2WrapperTextureUnitSettings;
typedef struct _CoglGles2WrapperSettings CoglGles2WrapperSettings;
typedef struct _CoglGles2WrapperProgram CoglGles2WrapperProgram;
typedef struct _CoglGles2WrapperShader CoglGles2WrapperShader;
#define COGL_GLES2_NUM_CUSTOM_UNIFORMS 16
#define COGL_GLES2_UNBOUND_CUSTOM_UNIFORM -2
/* Must be a power of two */
#define COGL_GLES2_MODELVIEW_STACK_SIZE 32
#define COGL_GLES2_PROJECTION_STACK_SIZE 2
#define COGL_GLES2_TEXTURE_STACK_SIZE 2
/* Accessors for the texture unit bit mask */
#define COGL_GLES2_TEXTURE_UNIT_IS_ENABLED(mask, unit) \
(((mask) & (1 << ((unit) * 2))) ? TRUE : FALSE)
#define COGL_GLES2_TEXTURE_UNIT_IS_ALPHA_ONLY(mask, unit) \
(((mask) & (1 << ((unit) * 2 + 1))) ? TRUE : FALSE)
#define COGL_GLES2_SET_BIT(mask, bit, val) \
((val) ? ((mask) |= (1 << (bit))) : ((mask) &= ~(1 << (bit))))
#define COGL_GLES2_TEXTURE_UNIT_SET_ENABLED(mask, unit, val) \
COGL_GLES2_SET_BIT ((mask), (unit) * 2, (val))
#define COGL_GLES2_TEXTURE_UNIT_SET_ALPHA_ONLY(mask, unit, val) \
COGL_GLES2_SET_BIT ((mask), (unit) * 2 + 1, (val))
#define COGL_GLES2_MAX_TEXTURE_UNITS (sizeof (guint32) * 8 / 2)
/* Dirty flags for shader uniforms */
enum
{
COGL_GLES2_DIRTY_MVP_MATRIX = 1 << 0,
COGL_GLES2_DIRTY_MODELVIEW_MATRIX = 1 << 1,
COGL_GLES2_DIRTY_TEXTURE_MATRICES = 1 << 2,
COGL_GLES2_DIRTY_FOG_DENSITY = 1 << 3,
COGL_GLES2_DIRTY_FOG_START = 1 << 4,
COGL_GLES2_DIRTY_FOG_END = 1 << 5,
COGL_GLES2_DIRTY_FOG_COLOR = 1 << 6,
COGL_GLES2_DIRTY_ALPHA_TEST_REF = 1 << 7,
COGL_GLES2_DIRTY_TEXTURE_UNITS = 1 << 8,
COGL_GLES2_DIRTY_ALL = (1 << 9) - 1
};
/* Dirty flags for shader vertex attribute pointers */
enum
{
COGL_GLES2_DIRTY_TEX_COORD_VERTEX_ATTRIB = 1 << 0
};
/* Dirty flags for shader vertex attributes enabled status */
enum
{
COGL_GLES2_DIRTY_TEX_COORD_ATTRIB_ENABLES = 1 << 0
};
struct _CoglGles2WrapperAttributes
{
GLint multi_texture_coords[COGL_GLES2_MAX_TEXTURE_UNITS];
};
struct _CoglGles2WrapperUniforms
{
GLint mvp_matrix_uniform;
GLint modelview_matrix_uniform;
GLint texture_matrix_uniforms[COGL_GLES2_MAX_TEXTURE_UNITS];
GLint texture_sampler_uniforms[COGL_GLES2_MAX_TEXTURE_UNITS];
GLint fog_density_uniform;
GLint fog_start_uniform;
GLint fog_end_uniform;
GLint fog_color_uniform;
GLint alpha_test_ref_uniform;
GLint texture_unit_uniform;
};
/* NB: We get a copy of this for each fragment/vertex
* program varient we generate so we try to keep it
* fairly lean */
struct _CoglGles2WrapperSettings
{
guint32 texture_units;
GLint alpha_test_func;
GLint fog_mode;
/* The current in-use user program */
CoglHandle user_program;
guint alpha_test_enabled:1;
guint fog_enabled:1;
};
struct _CoglGles2WrapperTextureUnit
{
GLfloat texture_stack[COGL_GLES2_TEXTURE_STACK_SIZE * 16];
GLuint texture_stack_pos;
GLenum texture_coords_type;
GLint texture_coords_size;
GLsizei texture_coords_stride;
const void *texture_coords_pointer;
guint texture_coords_enabled:1;
guint dirty_matrix:1; /*!< shader uniform needs updating */
};
struct _CoglGles2Wrapper
{
GLuint matrix_mode;
GLfloat modelview_stack[COGL_GLES2_MODELVIEW_STACK_SIZE * 16];
GLuint modelview_stack_pos;
GLfloat projection_stack[COGL_GLES2_PROJECTION_STACK_SIZE * 16];
GLuint projection_stack_pos;
guint active_texture_unit;
guint active_client_texture_unit;
CoglGles2WrapperTextureUnit texture_units[COGL_GLES2_MAX_TEXTURE_UNITS];
/* The combined modelview and projection matrix is only updated at
the last minute in glDrawArrays to avoid recalculating it for
every change to the modelview matrix */
GLboolean mvp_uptodate;
/* The currently bound program */
CoglGles2WrapperProgram *current_program;
/* The current settings. Effectively these represent anything that
* will require a modified fixed function shader */
CoglGles2WrapperSettings settings;
/* Whether the settings have changed since the last draw */
gboolean settings_dirty;
/* Uniforms that have changed since the last draw */
int dirty_uniforms, dirty_custom_uniforms;
/* Attribute pointers that have changed since the last draw */
int dirty_attribute_pointers;
/* Vertex attribute pointer enables that have changed since the last draw */
int dirty_vertex_attrib_enables;
/* List of all compiled program combinations */
GSList *compiled_programs;
/* List of all compiled vertex shaders */
GSList *compiled_vertex_shaders;
/* List of all compiled fragment shaders */
GSList *compiled_fragment_shaders;
/* Values for the uniforms */
GLfloat alpha_test_ref;
GLfloat fog_density;
GLfloat fog_start;
GLfloat fog_end;
GLfloat fog_color[4];
CoglBoxedValue custom_uniforms[COGL_GLES2_NUM_CUSTOM_UNIFORMS];
};
struct _CoglGles2WrapperProgram
{
GLuint program;
/* The settings that were used to generate this combination */
CoglGles2WrapperSettings settings;
/* The attributes for this program that are not bound up-front
* with constant indices */
CoglGles2WrapperAttributes attributes;
/* The uniforms for this program */
CoglGles2WrapperUniforms uniforms;
GLint custom_uniforms[COGL_GLES2_NUM_CUSTOM_UNIFORMS];
};
struct _CoglGles2WrapperShader
{
GLuint shader;
/* The settings that were used to generate this shader */
CoglGles2WrapperSettings settings;
};
/* These defines are missing from GL ES 2 but we can still use them
with the wrapper functions */
#ifndef GL_MODELVIEW
#define GL_MODELVIEW 0x1700
#define GL_PROJECTION 0x1701
#define GL_VERTEX_ARRAY 0x8074
#define GL_TEXTURE_COORD_ARRAY 0x8078
#define GL_COLOR_ARRAY 0x8076
#define GL_NORMAL_ARRAY 0x8075
#define GL_LIGHTING 0x0B50
#define GL_ALPHA_TEST 0x0BC0
#define GL_FOG 0x0B60
#define GL_FOG_COLOR 0x0B66
#define GL_FOG_MODE 0x0B65
#define GL_FOG_HINT 0x0C54
#define GL_FOG_DENSITY 0x0B62
#define GL_FOG_START 0x0B63
#define GL_FOG_END 0x0B64
#define GL_CLIP_PLANE0 0x3000
#define GL_CLIP_PLANE1 0x3001
#define GL_CLIP_PLANE2 0x3002
#define GL_CLIP_PLANE3 0x3003
#define GL_MAX_CLIP_PLANES 0x0D32
#define GL_MODELVIEW_MATRIX 0x0BA6
#define GL_PROJECTION_MATRIX 0x0BA7
#define GL_TEXTURE_MATRIX 0x0BA8
#define GL_GENERATE_MIPMAP 0x8191
#define GL_TEXTURE_ENV 0x2300
#define GL_TEXTURE_ENV_MODE 0x2200
#define GL_TEXTURE_ENV_COLOR 0x2201
#define GL_MODULATE 0x2100
#define GL_EXP 0x8000
#define GL_EXP2 0x8001
#define GL_ADD CGL_ADD
#define GL_ADD_SIGNED CGL_ADD_SIGNED
#define GL_INTERPOLATE CGL_INTERPOLATE
#define GL_SUBTRACT CGL_SUBTRACT
#define GL_DOT3_RGB CGL_DOT3_RGB
#define GL_DOT3_RGBA CGL_DOT3_RGBA
#define GL_CONSTANT CGL_CONSTANT
#define GL_PRIMARY_COLOR CGL_PRIMARY_COLOR
#define GL_PREVIOUS CGL_PREVIOUS
#define GL_COMBINE CGL_COMBINE
#define GL_COMBINE_RGB CGL_COMBINE_RGB
#define GL_COMBINE_ALPHA CGL_COMBINE_ALPHA
#define GL_SRC0_RGB CGL_SRC0_RGB
#define GL_OPERAND0_RGB CGL_OPERAND0_RGB
#define GL_SRC1_RGB CGL_SRC1_RGB
#define GL_OPERAND1_RGB CGL_OPERAND1_RGB
#define GL_SRC2_RGB CGL_SRC2_RGB
#define GL_OPERAND2_RGB CGL_OPERAND2_RGB
#define GL_SRC0_ALPHA CGL_SRC0_ALPHA
#define GL_OPERAND0_ALPHA CGL_OPERAND0_ALPHA
#define GL_SRC1_ALPHA CGL_SRC1_ALPHA
#define GL_OPERAND1_ALPHA CGL_OPERAND1_ALPHA
#define GL_SRC2_ALPHA CGL_SRC2_ALPHA
#define GL_OPERAND2_ALPHA CGL_OPERAND2_ALPHA
#define GL_AMBIENT CGL_AMBIENT
#define GL_DIFFUSE CGL_DIFFUSE
#define GL_SPECULAR CGL_SPECULAR
#define GL_EMISSION CGL_EMISSION
#define GL_SHININESS CGL_SHININESS
#endif /* GL_MODELVIEW */
void cogl_gles2_wrapper_init (CoglGles2Wrapper *wrapper);
void cogl_gles2_wrapper_deinit (CoglGles2Wrapper *wrapper);
void cogl_wrap_glPushMatrix ();
void cogl_wrap_glPopMatrix ();
void cogl_wrap_glMatrixMode (GLenum mode);
void cogl_wrap_glLoadIdentity ();
void cogl_wrap_glMultMatrixf (const GLfloat *m);
void cogl_wrap_glLoadMatrixf (const GLfloat *m);
void cogl_wrap_glFrustumf (GLfloat left, GLfloat right,
GLfloat bottom, GLfloat top,
GLfloat z_near, GLfloat z_far);
void cogl_wrap_glScalef (GLfloat x, GLfloat y, GLfloat z);
void cogl_wrap_glTranslatef (GLfloat x, GLfloat y, GLfloat z);
void cogl_wrap_glRotatef (GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
void cogl_wrap_glOrthof (GLfloat left, GLfloat right,
GLfloat bottom, GLfloat top,
GLfloat near, GLfloat far);
void cogl_wrap_glEnable (GLenum cap);
void cogl_wrap_glDisable (GLenum cap);
void cogl_wrap_glTexCoordPointer (GLint size, GLenum type, GLsizei stride,
const GLvoid *pointer);
void cogl_wrap_glVertexPointer (GLint size, GLenum type, GLsizei stride,
const GLvoid *pointer);
void cogl_wrap_glColorPointer (GLint size, GLenum type, GLsizei stride,
const GLvoid *pointer);
void cogl_wrap_glNormalPointer (GLenum type, GLsizei stride,
const GLvoid *pointer);
void cogl_wrap_glTexEnvi (GLenum target, GLenum pname, GLint param);
void cogl_wrap_glTexEnvfv (GLenum target, GLenum pname, const GLfloat *params);
void cogl_wrap_glClientActiveTexture (GLenum texture);
void cogl_wrap_glActiveTexture (GLenum texture);
void cogl_wrap_glEnableClientState (GLenum array);
void cogl_wrap_glDisableClientState (GLenum array);
void cogl_wrap_glAlphaFunc (GLenum func, GLclampf ref);
void cogl_wrap_glColor4f (GLclampf r, GLclampf g, GLclampf b, GLclampf a);
void cogl_wrap_glClipPlanef (GLenum plane, GLfloat *equation);
void cogl_wrap_glGetIntegerv (GLenum pname, GLint *params);
void cogl_wrap_glGetFloatv (GLenum pname, GLfloat *params);
void cogl_wrap_glFogf (GLenum pname, GLfloat param);
void cogl_wrap_glFogfv (GLenum pname, const GLfloat *params);
void cogl_wrap_glDrawArrays (GLenum mode, GLint first, GLsizei count);
void cogl_wrap_glDrawElements (GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices);
void cogl_wrap_glTexParameteri (GLenum target, GLenum pname, GLfloat param);
void cogl_gles2_wrapper_bind_texture (GLenum target, GLuint texture,
GLenum internal_format);
void cogl_wrap_glMaterialfv (GLenum face, GLenum pname, const GLfloat *params);
/* This function is only available on GLES 2 */
#define cogl_wrap_glGenerateMipmap glGenerateMipmap
void _cogl_gles2_clear_cache_for_program (CoglHandle program);
/* Remap the missing GL functions to use the wrappers */
#ifndef COGL_GLES2_WRAPPER_NO_REMAP
#define glDrawArrays cogl_wrap_glDrawArrays
#define glDrawElements cogl_wrap_glDrawElements
#define glPushMatrix cogl_wrap_glPushMatrix
#define glPopMatrix cogl_wrap_glPopMatrix
#define glMatrixMode cogl_wrap_glMatrixMode
#define glLoadIdentity cogl_wrap_glLoadIdentity
#define glMultMatrixf cogl_wrap_glMultMatrixf
#define glLoadMatrixf cogl_wrap_glLoadMatrixf
#define glFrustumf cogl_wrap_glFrustumf
#define glScalef cogl_wrap_glScalef
#define glTranslatef cogl_wrap_glTranslatef
#define glRotatef cogl_wrap_glRotatef
#define glOrthof cogl_wrap_glOrthof
#define glEnable cogl_wrap_glEnable
#define glDisable cogl_wrap_glDisable
#define glTexCoordPointer cogl_wrap_glTexCoordPointer
#define glVertexPointer cogl_wrap_glVertexPointer
#define glColorPointer cogl_wrap_glColorPointer
#define glNormalPointer cogl_wrap_glNormalPointer
#define glTexEnvi cogl_wrap_glTexEnvi
#define glTexEnvfv cogl_wrap_glTexEnvfv
#define glActiveTexture cogl_wrap_glActiveTexture
#define glClientActiveTexture cogl_wrap_glClientActiveTexture
#define glEnableClientState cogl_wrap_glEnableClientState
#define glDisableClientState cogl_wrap_glDisableClientState
#define glAlphaFunc cogl_wrap_glAlphaFunc
#define glColor4f cogl_wrap_glColor4f
#define glClipPlanef cogl_wrap_glClipPlanef
#define glGetIntegerv cogl_wrap_glGetIntegerv
#define glGetFloatv cogl_wrap_glGetFloatv
#define glFogf cogl_wrap_glFogf
#define glFogfv cogl_wrap_glFogfv
#define glTexParameteri cogl_wrap_glTexParameteri
#define glMaterialfv cogl_wrap_glMaterialfv
#endif /* COGL_GLES2_WRAPPER_NO_REMAP */
#else /* HAVE_COGL_GLES2 */
/* The extra third parameter of the bind texture wrapper isn't needed
so we can just directly call glBindTexture */
#define cogl_gles2_wrapper_bind_texture(target, texture, internal_format) \
glBindTexture ((target), (texture))
/* COGL uses the automatic mipmap generation for GLES 1 so
glGenerateMipmap doesn't need to do anything */
#define cogl_wrap_glGenerateMipmap(x) ((void) 0)
/* GLES doesn't have glDrawRangeElements, so we simply pretend it does
* but that it makes no use of the start, end constraints: */
#define glDrawRangeElements(mode, start, end, count, type, indices) \
glDrawElements (mode, count, type, indices)
#endif /* HAVE_COGL_GLES2 */
G_END_DECLS
#endif /* __COGL_GLES2_WRAPPER_H__ */
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