mutter/cogl/cogl/cogl-types.h

/*
 * Cogl
 *
 * A Low Level GPU Graphics and Utilities API
 *
 * Copyright (C) 2008,2009 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *
 */

#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif

#ifndef __COGL_TYPES_H__
#define __COGL_TYPES_H__

#include <stdint.h>
#include <stddef.h>

#include <cogl/cogl-defines.h>
#include <cogl/cogl-macros.h>
#include <graphene.h>

#include <glib.h>
#include <glib-object.h>

G_BEGIN_DECLS

/**
 * SECTION:cogl-types
 * @short_description: Types used throughout the library
 *
 * General types used by various Cogl functions.
*/

/* Some structures are meant to be opaque but they have public
   definitions because we want the size to be public so they can be
   allocated on the stack. This macro is used to ensure that users
   don't accidentally access private members */
#ifdef COGL_COMPILATION
#define COGL_PRIVATE(x) x
#else
#define COGL_PRIVATE(x) private_member_ ## x
#endif

/* To help catch accidental changes to public structs that should
 * be stack allocated we use this macro to compile time assert that
 * a struct size is as expected.
 */
#define COGL_STRUCT_SIZE_ASSERT(TYPE, SIZE) \
typedef struct { \
          char compile_time_assert_ ## TYPE ## _size[ \
              (sizeof (TYPE) == (SIZE)) ? 1 : -1]; \
        } _ ## TYPE ## SizeCheck

/**
 * CoglHandle:
 *
 * Type used for storing references to cogl objects, the CoglHandle is
 * a fully opaque type without any public data members.
 */
typedef void * CoglHandle;

#define COGL_TYPE_HANDLE        (cogl_handle_get_type ())
COGL_EXPORT GType
cogl_handle_get_type (void) G_GNUC_CONST;

typedef struct _CoglFramebuffer CoglFramebuffer;

/**
 * CoglAngle:
 *
 * Integer representation of an angle such that 1024 corresponds to
 * full circle (i.e., 2 * pi).
 */
typedef int32_t CoglAngle;

typedef struct _CoglColor               CoglColor;
typedef struct _CoglTextureVertex       CoglTextureVertex;

/**
 * CoglDmaBufHandle: (skip)
 *
 * An opaque type that tracks the lifetime of a DMA buffer fd. Release
 * with cogl_dma_buf_handle_free().
 */
typedef struct _CoglDmaBufHandle CoglDmaBufHandle;

/* Enum declarations */

#define COGL_A_BIT              (1 << 4)
#define COGL_BGR_BIT            (1 << 5)
#define COGL_AFIRST_BIT         (1 << 6)
#define COGL_PREMULT_BIT        (1 << 7)
#define COGL_DEPTH_BIT          (1 << 8)
#define COGL_STENCIL_BIT        (1 << 9)

/**
 * CoglBufferTarget:
 * @COGL_WINDOW_BUFFER: FIXME
 * @COGL_OFFSCREEN_BUFFER: FIXME
 *
 * Target flags for FBOs.
 */
typedef enum
{
  COGL_WINDOW_BUFFER      = (1 << 1),
  COGL_OFFSCREEN_BUFFER   = (1 << 2)
} CoglBufferTarget;

/**
 * CoglColor:
 * @red: amount of red
 * @green: amount of green
 * @blue: amount of green
 * @alpha: alpha
 *
 * A structure for holding a color definition. The contents of
 * the CoglColor structure are private and should never by accessed
 * directly.
 */
struct _CoglColor
{
  /*< private >*/
  uint8_t COGL_PRIVATE (red);
  uint8_t COGL_PRIVATE (green);
  uint8_t COGL_PRIVATE (blue);

  uint8_t COGL_PRIVATE (alpha);
};
COGL_STRUCT_SIZE_ASSERT (CoglColor, 4);

/**
 * CoglTextureVertex:
 * @x: Model x-coordinate
 * @y: Model y-coordinate
 * @z: Model z-coordinate
 * @tx: Texture x-coordinate
 * @ty: Texture y-coordinate
 * @color: The color to use at this vertex. This is ignored if
 *   use_color is %FALSE when calling cogl_polygon()
 *
 * Used to specify vertex information when calling cogl_polygon()
 */
struct _CoglTextureVertex
{
  float x, y, z;
  float tx, ty;

  CoglColor color;
};
COGL_STRUCT_SIZE_ASSERT (CoglTextureVertex, 24);

/**
 * COGL_BLEND_STRING_ERROR:
 *
 * #GError domain for blend string parser errors
 */
#define COGL_BLEND_STRING_ERROR (cogl_blend_string_error_quark ())

/**
 * CoglBlendStringError:
 * @COGL_BLEND_STRING_ERROR_PARSE_ERROR: Generic parse error
 * @COGL_BLEND_STRING_ERROR_ARGUMENT_PARSE_ERROR: Argument parse error
 * @COGL_BLEND_STRING_ERROR_INVALID_ERROR: Internal parser error
 * @COGL_BLEND_STRING_ERROR_GPU_UNSUPPORTED_ERROR: Blend string not
 *   supported by the GPU
 *
 * Error enumeration for the blend strings parser
 */
typedef enum /*< prefix=COGL_BLEND_STRING_ERROR >*/
{
  COGL_BLEND_STRING_ERROR_PARSE_ERROR,
  COGL_BLEND_STRING_ERROR_ARGUMENT_PARSE_ERROR,
  COGL_BLEND_STRING_ERROR_INVALID_ERROR,
  COGL_BLEND_STRING_ERROR_GPU_UNSUPPORTED_ERROR
} CoglBlendStringError;

COGL_EXPORT uint32_t
cogl_blend_string_error_quark (void);

#define COGL_SYSTEM_ERROR (_cogl_system_error_quark ())

/**
 * CoglSystemError:
 * @COGL_SYSTEM_ERROR_UNSUPPORTED: You tried to use a feature or
 *    configuration not currently available.
 * @COGL_SYSTEM_ERROR_NO_MEMORY: You tried to allocate a resource
 *    such as a texture and there wasn't enough memory.
 *
 * Error enumeration for Cogl
 *
 * The @COGL_SYSTEM_ERROR_UNSUPPORTED error can be thrown for a
 * variety of reasons. For example:
 *
 * <itemizedlist>
 *  <listitem><para>You've tried to use a feature that is not
 *   advertised by cogl_has_feature().</para></listitem>
 *  <listitem><para>The GPU can not handle the configuration you have
 *   requested. An example might be if you try to use too many texture
 *   layers in a single #CoglPipeline</para></listitem>
 *  <listitem><para>The driver does not support some
 *   configuration.</para></listiem>
 * </itemizedlist>
 *
 * Currently this is only used by Cogl API marked as experimental so
 * this enum should also be considered experimental.
 */
typedef enum /*< prefix=COGL_ERROR >*/
{
  COGL_SYSTEM_ERROR_UNSUPPORTED,
  COGL_SYSTEM_ERROR_NO_MEMORY
} CoglSystemError;

COGL_EXPORT uint32_t
_cogl_system_error_quark (void);

/**
 * CoglAttributeType:
 * @COGL_ATTRIBUTE_TYPE_BYTE: Data is the same size of a byte
 * @COGL_ATTRIBUTE_TYPE_UNSIGNED_BYTE: Data is the same size of an
 *   unsigned byte
 * @COGL_ATTRIBUTE_TYPE_SHORT: Data is the same size of a short integer
 * @COGL_ATTRIBUTE_TYPE_UNSIGNED_SHORT: Data is the same size of
 *   an unsigned short integer
 * @COGL_ATTRIBUTE_TYPE_FLOAT: Data is the same size of a float
 *
 * Data types for the components of a vertex attribute.
 */
typedef enum
{
  COGL_ATTRIBUTE_TYPE_BYTE           = 0x1400,
  COGL_ATTRIBUTE_TYPE_UNSIGNED_BYTE  = 0x1401,
  COGL_ATTRIBUTE_TYPE_SHORT          = 0x1402,
  COGL_ATTRIBUTE_TYPE_UNSIGNED_SHORT = 0x1403,
  COGL_ATTRIBUTE_TYPE_FLOAT          = 0x1406
} CoglAttributeType;

/**
 * CoglIndicesType:
 * @COGL_INDICES_TYPE_UNSIGNED_BYTE: Your indices are unsigned bytes
 * @COGL_INDICES_TYPE_UNSIGNED_SHORT: Your indices are unsigned shorts
 * @COGL_INDICES_TYPE_UNSIGNED_INT: Your indices are unsigned ints
 *
 * You should aim to use the smallest data type that gives you enough
 * range, since it reduces the size of your index array and can help
 * reduce the demand on memory bandwidth.
 *
 * Note that %COGL_INDICES_TYPE_UNSIGNED_INT is only supported if the
 * %COGL_FEATURE_ID_UNSIGNED_INT_INDICES feature is available. This
 * should always be available on OpenGL but on OpenGL ES it will only
 * be available if the GL_OES_element_index_uint extension is
 * advertized.
 */
typedef enum
{
  COGL_INDICES_TYPE_UNSIGNED_BYTE,
  COGL_INDICES_TYPE_UNSIGNED_SHORT,
  COGL_INDICES_TYPE_UNSIGNED_INT
} CoglIndicesType;

/**
 * CoglVerticesMode:
 * @COGL_VERTICES_MODE_POINTS: FIXME, equivalent to
 * <constant>GL_POINTS</constant>
 * @COGL_VERTICES_MODE_LINES: FIXME, equivalent to <constant>GL_LINES</constant>
 * @COGL_VERTICES_MODE_LINE_LOOP: FIXME, equivalent to
 * <constant>GL_LINE_LOOP</constant>
 * @COGL_VERTICES_MODE_LINE_STRIP: FIXME, equivalent to
 * <constant>GL_LINE_STRIP</constant>
 * @COGL_VERTICES_MODE_TRIANGLES: FIXME, equivalent to
 * <constant>GL_TRIANGLES</constant>
 * @COGL_VERTICES_MODE_TRIANGLE_STRIP: FIXME, equivalent to
 * <constant>GL_TRIANGLE_STRIP</constant>
 * @COGL_VERTICES_MODE_TRIANGLE_FAN: FIXME, equivalent to <constant>GL_TRIANGLE_FAN</constant>
 *
 * Different ways of interpreting vertices when drawing.
 */
typedef enum
{
  COGL_VERTICES_MODE_POINTS = 0x0000,
  COGL_VERTICES_MODE_LINES = 0x0001,
  COGL_VERTICES_MODE_LINE_LOOP = 0x0002,
  COGL_VERTICES_MODE_LINE_STRIP = 0x0003,
  COGL_VERTICES_MODE_TRIANGLES = 0x0004,
  COGL_VERTICES_MODE_TRIANGLE_STRIP = 0x0005,
  COGL_VERTICES_MODE_TRIANGLE_FAN = 0x0006
} CoglVerticesMode;

/* NB: The above definitions are taken from gl.h equivalents */


/* XXX: should this be CoglMaterialDepthTestFunction?
 * It makes it very verbose but would be consistent with
 * CoglMaterialWrapMode */

/**
 * CoglDepthTestFunction:
 * @COGL_DEPTH_TEST_FUNCTION_NEVER: Never passes.
 * @COGL_DEPTH_TEST_FUNCTION_LESS: Passes if the fragment's depth
 * value is less than the value currently in the depth buffer.
 * @COGL_DEPTH_TEST_FUNCTION_EQUAL: Passes if the fragment's depth
 * value is equal to the value currently in the depth buffer.
 * @COGL_DEPTH_TEST_FUNCTION_LEQUAL: Passes if the fragment's depth
 * value is less or equal to the value currently in the depth buffer.
 * @COGL_DEPTH_TEST_FUNCTION_GREATER: Passes if the fragment's depth
 * value is greater than the value currently in the depth buffer.
 * @COGL_DEPTH_TEST_FUNCTION_NOTEQUAL: Passes if the fragment's depth
 * value is not equal to the value currently in the depth buffer.
 * @COGL_DEPTH_TEST_FUNCTION_GEQUAL: Passes if the fragment's depth
 * value greater than or equal to the value currently in the depth buffer.
 * @COGL_DEPTH_TEST_FUNCTION_ALWAYS: Always passes.
 *
 * When using depth testing one of these functions is used to compare
 * the depth of an incoming fragment against the depth value currently
 * stored in the depth buffer. The function is changed using
 * cogl_depth_state_set_test_function().
 *
 * The test is only done when depth testing is explicitly enabled. (See
 * cogl_depth_state_set_test_enabled())
 */
typedef enum
{
  COGL_DEPTH_TEST_FUNCTION_NEVER    = 0x0200,
  COGL_DEPTH_TEST_FUNCTION_LESS     = 0x0201,
  COGL_DEPTH_TEST_FUNCTION_EQUAL    = 0x0202,
  COGL_DEPTH_TEST_FUNCTION_LEQUAL   = 0x0203,
  COGL_DEPTH_TEST_FUNCTION_GREATER  = 0x0204,
  COGL_DEPTH_TEST_FUNCTION_NOTEQUAL = 0x0205,
  COGL_DEPTH_TEST_FUNCTION_GEQUAL   = 0x0206,
  COGL_DEPTH_TEST_FUNCTION_ALWAYS   = 0x0207
} CoglDepthTestFunction;
/* NB: The above definitions are taken from gl.h equivalents */

typedef enum /*< prefix=COGL_RENDERER_ERROR >*/
{
  COGL_RENDERER_ERROR_XLIB_DISPLAY_OPEN,
  COGL_RENDERER_ERROR_BAD_CONSTRAINT
} CoglRendererError;

/**
 * CoglFilterReturn:
 * @COGL_FILTER_CONTINUE: The event was not handled, continues the
 *                        processing
 * @COGL_FILTER_REMOVE: Remove the event, stops the processing
 *
 * Return values for the #CoglXlibFilterFunc and #CoglWin32FilterFunc functions.
 */
typedef enum _CoglFilterReturn { /*< prefix=COGL_FILTER >*/
  COGL_FILTER_CONTINUE,
  COGL_FILTER_REMOVE
} CoglFilterReturn;

typedef enum _CoglWinsysFeature
{
  /* Available if its possible to query a counter that
   * increments at each vblank. */
  COGL_WINSYS_FEATURE_VBLANK_COUNTER,

  /* Available if its possible to wait until the next vertical
   * blank period */
  COGL_WINSYS_FEATURE_VBLANK_WAIT,

  /* Available if the window system supports mapping native
   * pixmaps to textures. */
  COGL_WINSYS_FEATURE_TEXTURE_FROM_PIXMAP,

  /* Available if the window system supports reporting an event
   * for swap buffer completions. */
  COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT,

  /* Available if it's possible to swap a list of sub rectangles
   * from the back buffer to the front buffer */
  COGL_WINSYS_FEATURE_SWAP_REGION,

  /* Available if swap_region requests can be automatically throttled
   * to the vblank frequency. */
  COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE,

  /* Available if the swap region implementation won't tear and thus
   * only needs to be throttled to the framerate */
  COGL_WINSYS_FEATURE_SWAP_REGION_SYNCHRONIZED,

  /* Available if the age of the back buffer can be queried */
  COGL_WINSYS_FEATURE_BUFFER_AGE,

  /* Available if the winsys directly handles _SYNC and _COMPLETE events */
  COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT,

  COGL_WINSYS_FEATURE_N_FEATURES
} CoglWinsysFeature;

/**
 * CoglWinding:
 * @COGL_WINDING_CLOCKWISE: Vertices are in a clockwise order
 * @COGL_WINDING_COUNTER_CLOCKWISE: Vertices are in a counter-clockwise order
 *
 * Enum used to represent the two directions of rotation. This can be
 * used to set the front face for culling by calling
 * cogl_pipeline_set_front_face_winding().
 */
typedef enum
{
  COGL_WINDING_CLOCKWISE,
  COGL_WINDING_COUNTER_CLOCKWISE
} CoglWinding;

/**
 * CoglBufferBit:
 * @COGL_BUFFER_BIT_COLOR: Selects the primary color buffer
 * @COGL_BUFFER_BIT_DEPTH: Selects the depth buffer
 * @COGL_BUFFER_BIT_STENCIL: Selects the stencil buffer
 *
 * Types of auxiliary buffers
 */
typedef enum
{
  COGL_BUFFER_BIT_COLOR   = 1L<<0,
  COGL_BUFFER_BIT_DEPTH   = 1L<<1,
  COGL_BUFFER_BIT_STENCIL = 1L<<2
} CoglBufferBit;

/**
 * CoglReadPixelsFlags:
 * @COGL_READ_PIXELS_COLOR_BUFFER: Read from the color buffer
 *
 * Flags for cogl_framebuffer_read_pixels_into_bitmap()
 */
typedef enum /*< prefix=COGL_READ_PIXELS >*/
{
  COGL_READ_PIXELS_COLOR_BUFFER = 1L << 0
} CoglReadPixelsFlags;

/**
 * CoglStereoMode:
 * @COGL_STEREO_BOTH: draw to both stereo buffers
 * @COGL_STEREO_LEFT: draw only to the left stereo buffer
 * @COGL_STEREO_RIGHT: draw only to the left stereo buffer
 *
 * Represents how draw should affect the two buffers
 * of a stereo framebuffer. See cogl_framebuffer_set_stereo_mode().
 */
typedef enum
{
  COGL_STEREO_BOTH,
  COGL_STEREO_LEFT,
  COGL_STEREO_RIGHT
} CoglStereoMode;

G_END_DECLS

#endif /* __COGL_TYPES_H__ */