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e183712227
mutter/cogl.h.in
Øyvind Kolås e183712227 * clutter/cogl/cogl.h.in: added documentation.
2008-04-28 14:00:46 +00:00

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/*
* Clutter COGL
*
* A basic GL/GLES Abstraction/Utility Layer
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2007 OpenedHand
*
* 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.
*/
/*
* COGL
* ====
*
* 'cogl' is a very simple abstraction layer which wraps GL and GLES.
*
*
* !!!! DO NOT USE THIS API YET OUTSIDE OF CLUTTER CORE !!!!
* THE API WILL FLUCTUATE WILDLY
*
* TODO:
* - Use ClutterReal for fixed/float params.
* - Add Perspective/viewport setup
* - Add Features..
*/
#ifndef __COGL_H__
#define __COGL_H__
#include <glib.h>
#include <clutter/clutter-color.h>
#include <clutter/clutter-feature.h>
#include <clutter/clutter-fixed.h>
#include <clutter/clutter-types.h>
#include <cogl/cogl-defines-@CLUTTER_COGL@.h>
G_BEGIN_DECLS
/* Enum declarations */
#define COGL_PIXEL_FORMAT_24 2
#define COGL_PIXEL_FORMAT_32 3
#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_UNORDERED_MASK 0x0F
#define COGL_UNPREMULT_MASK 0x7F
/**
* CoglPixelFormat:
* @COGL_PIXEL_FORMAT_ANY:
* @COGL_PIXEL_FORMAT_A_8:
* @COGL_PIXEL_FORMAT_RGB_888:
* @COGL_PIXEL_FORMAT_BGR_888:
* @COGL_PIXEL_FORMAT_RGBA_8888:
* @COGL_PIXEL_FORMAT_BGRA_8888:
* @COGL_PIXEL_FORMAT_ARGB_8888:
* @COGL_PIXEL_FORMAT_ABGR_8888:
* @COGL_PIXEL_FORMAT_RGBA_8888_PRE:
* @COGL_PIXEL_FORMAT_BGRA_8888_PRE:
* @COGL_PIXEL_FORMAT_ARGB_8888_PRE:
* @COGL_PIXEL_FORMAT_ABGR_8888_PRE:
* @COGL_PIXEL_FORMAT_RGB_565:
* @COGL_PIXEL_FORMAT_RGBA_4444:
* @COGL_PIXEL_FORMAT_RGBA_5551:
* @COGL_PIXEL_FORMAT_RGBA_4444_PRE:
* @COGL_PIXEL_FORMAT_RGBA_5551_PRE:
* @COGL_PIXEL_FORMAT_YUV:
* @COGL_PIXEL_FORMAT_G_8:
*
* Pixel formats used by COGL.
*/
typedef enum
{
COGL_PIXEL_FORMAT_ANY = 0,
COGL_PIXEL_FORMAT_A_8 = 1 | COGL_A_BIT,
COGL_PIXEL_FORMAT_RGB_888 = COGL_PIXEL_FORMAT_24,
COGL_PIXEL_FORMAT_BGR_888 = (COGL_PIXEL_FORMAT_24 | COGL_BGR_BIT),
COGL_PIXEL_FORMAT_RGBA_8888 = COGL_PIXEL_FORMAT_32 | COGL_A_BIT,
COGL_PIXEL_FORMAT_BGRA_8888 = (COGL_PIXEL_FORMAT_32 | COGL_A_BIT | COGL_BGR_BIT),
COGL_PIXEL_FORMAT_ARGB_8888 = (COGL_PIXEL_FORMAT_32 | COGL_A_BIT | COGL_AFIRST_BIT),
COGL_PIXEL_FORMAT_ABGR_8888 = (COGL_PIXEL_FORMAT_32 | COGL_A_BIT | COGL_BGR_BIT | COGL_AFIRST_BIT),
COGL_PIXEL_FORMAT_RGBA_8888_PRE = (COGL_PIXEL_FORMAT_32 | COGL_A_BIT | COGL_PREMULT_BIT),
COGL_PIXEL_FORMAT_BGRA_8888_PRE = (COGL_PIXEL_FORMAT_32 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_BGR_BIT),
COGL_PIXEL_FORMAT_ARGB_8888_PRE = (COGL_PIXEL_FORMAT_32 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_AFIRST_BIT),
COGL_PIXEL_FORMAT_ABGR_8888_PRE = (COGL_PIXEL_FORMAT_32 | COGL_A_BIT | COGL_PREMULT_BIT | COGL_BGR_BIT | COGL_AFIRST_BIT),
COGL_PIXEL_FORMAT_RGB_565 = 4,
COGL_PIXEL_FORMAT_RGBA_4444 = 5 | COGL_A_BIT,
COGL_PIXEL_FORMAT_RGBA_5551 = 6 | COGL_A_BIT,
COGL_PIXEL_FORMAT_RGBA_4444_PRE = (COGL_PIXEL_FORMAT_RGBA_4444 | COGL_A_BIT | COGL_PREMULT_BIT),
COGL_PIXEL_FORMAT_RGBA_5551_PRE = (COGL_PIXEL_FORMAT_RGBA_5551 | COGL_A_BIT | COGL_PREMULT_BIT),
COGL_PIXEL_FORMAT_YUV = 7,
COGL_PIXEL_FORMAT_G_8 = 8
} CoglPixelFormat;
/**
* CoglFeatureFlags:
* @COGL_FEATURE_TEXTURE_RECTANGLE:
* @COGL_FEATURE_TEXTURE_NPOT:
* @COGL_FEATURE_TEXTURE_YUV:
* @COGL_FEATURE_TEXTURE_READ_PIXELS:
* @COGL_FEATURE_SHADERS_GLSL:
* @COGL_FEATURE_OFFSCREEN:
* @COGL_FEATURE_OFFSCREEN_MULTISAMPLE:
* @COGL_FEATURE_OFFSCREEN_BLIT:
* @COGL_FEATURE_FOUR_CLIP_PLANES:
* @COGL_FEATURE_STENCIL_BUFFER:
*
* Flags for the supported features.
*/
typedef enum
{
COGL_FEATURE_TEXTURE_RECTANGLE = (1 << 1),
COGL_FEATURE_TEXTURE_NPOT = (1 << 2),
COGL_FEATURE_TEXTURE_YUV = (1 << 3),
COGL_FEATURE_TEXTURE_READ_PIXELS = (1 << 4),
COGL_FEATURE_SHADERS_GLSL = (1 << 5),
COGL_FEATURE_OFFSCREEN = (1 << 6),
COGL_FEATURE_OFFSCREEN_MULTISAMPLE = (1 << 7),
COGL_FEATURE_OFFSCREEN_BLIT = (1 << 8),
COGL_FEATURE_FOUR_CLIP_PLANES = (1 << 9),
COGL_FEATURE_STENCIL_BUFFER = (1 << 10)
} CoglFeatureFlags;
/**
* CoglBufferTarget:
* @COGL_WINDOW_BUFFER:
* @COGL_MASK_BUFFER:
* @COGL_OFFSCREEN_BUFFER:
*
*
*/
typedef enum
{
COGL_WINDOW_BUFFER = (1 << 1),
COGL_MASK_BUFFER = (1 << 2),
COGL_OFFSCREEN_BUFFER = (1 << 3)
} CoglBufferTarget;
/**
* 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_texture_polygon().
*
* Used to specify vertex information when calling cogl_texture_polygon().
*/
struct _CoglTextureVertex
{
ClutterFixed x, y, z;
ClutterFixed tx, ty;
ClutterColor color;
};
typedef struct _CoglTextureVertex CoglTextureVertex;
/* Context manipulation */
/**
* cogl_create_context:
*
*/
gboolean
cogl_create_context (void);
/**
* cogl_destroy_context:
*
*/
void
cogl_destroy_context (void);
/* Misc */
/**
* COGL_INVALID_HANDLE:
*
* A cogl handle that is not valid, used for unitialized handles as well as error conditions.
*/
#define COGL_INVALID_HANDLE NULL
/**
* CoglHandle:
*
* Type used for storing references to cogl objects, the CoglHandle is
* a fully opaque type without any public data members.
*/
typedef gpointer CoglHandle;
/**
* CoglFuncPtr:
*
* The type used by cogl for function pointers, note that this type
* is used as a generic catch-all cast for function pointers and the
* actual arguments and return type may be different.
*/
typedef void (* CoglFuncPtr) (void);
/**
* cogl_get_features:
*
* Returns all of the features supported by COGL.
*
* Return value: A logical OR of all the supported COGL features.
*
* Since: 0.8
*/
ClutterFeatureFlags
cogl_get_features (void);
/**
* cogl_features_available:
* @features: A bitmask of features to check for
*
* Checks whether the given COGL features are available. Multiple
* features can be checked for by or-ing them together with the '|'
* operator. %TRUE is only returned if all of the requested features
* are available.
*
* Return value: %TRUE if the features are available, %FALSE otherwise.
*/
gboolean
cogl_features_available (CoglFeatureFlags features);
/**
* cogl_get_proc_address:
* @name: the name of the function.
*
* Gets a pointer to a given GL or GL ES extension function. This acts
* as a wrapper around glXGetProcAddress() or whatever is the
* appropriate function for the current backend.
*
* Return value: a pointer to the requested function or %NULL if the
* function is not available.
*/
CoglFuncPtr
cogl_get_proc_address (const gchar* name);
/**
* cogl_check_extension:
* @name: extension to check for
* @ext: list of extensions
*
* Check whether @name occurs in list of extensions in @ext.
*
* Returns: %TRUE if the extension occurs in the list, %FALSE otherwize.
*/
gboolean
cogl_check_extension (const gchar *name,
const gchar *ext);
/**
* cogl_get_bitmasks:
* @red: Return location for the number of red bits or %NULL
* @green: Return location for the number of green bits or %NULL
* @blue: Return location for the number of blue bits or %NULL
* @alpha: Return location for the number of alpha bits or %NULL
*
* Gets the number of bitplanes used for each of the color components
* in the color buffer. Pass %NULL for any of the arguments if the
* value is not required.
*/
void
cogl_get_bitmasks (gint *red,
gint *green,
gint *blue,
gint *alpha);
/* XXX: should this be internal? */
/**
* cogl_perspective:
* @fovy: Vertical of view angle in degrees.
* @aspect: Aspect ratio of diesplay
* @zNear: Nearest visible point
* @zFar: Furthest visible point along the z-axis
*
* Multiplies the current set matrix with a projection matrix based
* on the provided values.
*/
void
cogl_perspective (ClutterFixed fovy,
ClutterFixed aspect,
ClutterFixed zNear,
ClutterFixed zFar);
/**
* cogl_setup_viewport:
* @width: Width of the viewport
* @height: Height of the viewport
* @fovy: Field of view angle in degrees
* @aspect: Aspect ratio to determine the field of view along the x-axis
* @z_near: Nearest visible point along the z-axis
* @z_far: Furthest visible point along the z-axis
*
* Replaces the current viewport and projection matrix with the given
* values. The viewport is placed at the top left corner of the window
* with the given width and height. The projection matrix is replaced
* with one that has a viewing angle of @fovy along the y-axis and a
* view scaled according to @aspect along the x-axis. The view is
* clipped according to @z_near and @z_far on the z-axis.
*/
void
cogl_setup_viewport (guint width,
guint height,
ClutterFixed fovy,
ClutterFixed aspect,
ClutterFixed z_near,
ClutterFixed z_far);
/**
* cogl_push_matrix:
*
* Store the current model-view matrix on the matrix stack. The matrix
* can later be restored with cogl_pop_matrix().
*/
void
cogl_push_matrix (void);
/**
* cogl_pop_matrix:
*
* Restore the current model-view matrix from the matrix stack.
*/
void
cogl_pop_matrix (void);
/**
* cogl_scale:
* @x: Amount to scale along the x-axis
* @y: Amount to scale along the y-axis
*
* Multiplies the current model-view matrix by one that scales the x
* and y axes by the given values.
*/
void
cogl_scale (ClutterFixed x,
ClutterFixed y);
/**
* cogl_translatex:
* @x: Distance to translate along the x-axis
* @y: Distance to translate along the y-axis
* @z: Distance to translate along the z-axis
*
* Multiplies the current model-view matrix by one that translates the
* model along all three axes according to the given values.
*/
void
cogl_translatex (ClutterFixed x,
ClutterFixed y,
ClutterFixed z);
/**
* cogl_translate:
* @x: Distance to translate along the x-axis
* @y: Distance to translate along the y-axis
* @z: Distance to translate along the z-axis
*
* Integer version of cogl_translatex(). Multiplies the current
* model-view matrix by one that translates the model along all three
* axes according to the given values.
*/
void
cogl_translate (gint x,
gint y,
gint z);
/**
* cogl_rotatex:
* @angle: Angle in degrees to rotate.
* @x: X-component of vertex to rotate around.
* @y: Y-component of vertex to rotate around.
* @z: Z-component of vertex to rotate around.
*
* Multiplies the current model-view matrix by one that rotates the
* model around the vertex specified by @x, @y and @z. The rotation
* follows the right-hand thumb rule so for example rotating by 10
* degrees about the vertex (0, 0, 1) causes a small counter-clockwise
* rotation.
*/
void
cogl_rotatex (ClutterFixed angle,
gint x,
gint y,
gint z);
/**
* cogl_rotate:
* @angle: Angle in degrees to rotate.
* @x: X-component of vertex to rotate around.
* @y: Y-component of vertex to rotate around.
* @z: Z-component of vertex to rotate around.
*
* Integer version of cogl_rotatex(). Multiplies the current
* model-view matrix by one that rotates the model around the vertex
* specified by @x, @y and @z.
*/
void
cogl_rotate (gint angle,
gint x,
gint y,
gint z);
/**
* cogl_get_modelview_matrix:
* @m: pointer to a 4x4 array of #ClutterFixed<!-- -->s to receive the matrix
*
* Stores the current model-view matrix in @m. The matrix is in
* column-major order.
*/
void
cogl_get_modelview_matrix (ClutterFixed m[16]);
/**
* cogl_get_projection_matrix:
* @m: pointer to a 4x4 array of #ClutterFixed<!-- -->s to receive the matrix
*
* Stores the current projection matrix in @m. The matrix is in
* column-major order.
*/
void
cogl_get_projection_matrix (ClutterFixed m[16]);
/**
* cogl_get_viewport:
* @v: pointer to a 4 element array of #ClutterFixed<!-- -->s to
* receive the viewport dimensions.
*
* Stores the current viewport in @v. @v[0] and @v[1] get the x and y
* position of the viewport and @v[2] and @v[3] get the width and
* height.
*/
void
cogl_get_viewport (ClutterFixed v[4]);
/**
* cogl_clip_set:
* @x_offset: left edge of the clip rectangle
* @y_offset: top edge of the clip rectangle
* @width: width of the clip rectangle
* @height: height of the clip rectangle
*
* Specifies a rectangular clipping area for all subsequent drawing
* operations. Any drawing commands that extend outside the rectangle
* will be clipped so that only the portion inside the rectangle will
* be displayed. The rectangle dimensions are transformed by the
* current model-view matrix.
*/
void
cogl_clip_set (ClutterFixed x_offset,
ClutterFixed y_offset,
ClutterFixed width,
ClutterFixed height);
/**
* cogl_clip_unset:
*
* Removes the current clipping rectangle so that all drawing
* operations extend to full size of the viewport again.
*/
void
cogl_clip_unset (void);
/**
* cogl_enable_depth_test:
* @setting: %TRUE to enable depth testing or %FALSE to disable.
*
* Sets whether depth testing is enabled. If it is disabled then the
* order that actors are layered on the screen depends solely on the
* order specified using clutter_actor_raise() and
* clutter_actor_lower(), otherwise it will also take into account the
* actor's depth. Depth testing is disabled by default.
*/
void
cogl_enable_depth_test (gboolean setting);
/**
* cogl_alpha_func:
* @func: the comparison function to use, one of CGL_NEVER, CGL_LESS,
* CGL_EQUAL, CGL_LEQUAL, CGL_GREATER, CGL_NOTEQUAL, CGL_GEQUAL and GL_ALWAYS.
* @ref: reference value.
*
* Changes the alpha test to use the specified function specified in @func,
* comparing with the value in @ref. The default function is CGL_ALWAYS the
* initial reference value is 1.0.
*/
void
cogl_alpha_func (COGLenum func,
ClutterFixed ref);
/**
* cogl_fog_set:
* @fog_color: The color of the fog
* @density: Ignored
* @z_near: Position along z-axis where no fogging should be applied
* @z_far: Position along z-axes where full fogging should be applied
*
* Enables fogging. Fogging causes vertices that are further away from
* the eye to be rendered with a different color. The color is
* linearly interpolated so that vertices at @z_near are drawn fully
* with their original color and vertices at @z_far are drawn fully
* with @fog_color. Fogging will remain enabled until the next call to
* cogl_paint_init().
*/
void
cogl_fog_set (const ClutterColor *fog_color,
ClutterFixed density,
ClutterFixed z_near,
ClutterFixed z_far);
/**
* cogl_paint_init:
* @color: Background color to clear to
*
* Clears the color buffer to @color. The depth buffer and stencil
* buffers are also cleared and fogging and lighting are disabled.
*/
void
cogl_paint_init (const ClutterColor *color);
/* Textures api */
/**
* cogl_texture_new_with_size:
* @width: width of texture in pixels.
* @height: height of texture in pixels.
* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
* texture fit GPU limitations.
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the texture.
*
* Create a new texture with specified dimensions and pixel format.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if texture creation failed.
*/
CoglHandle
cogl_texture_new_with_size (guint width,
guint height,
gint max_waste,
CoglPixelFormat internal_format);
/**
* cogl_texture_new_from_file:
* @filename: the file to load
* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
* texture fit GPU limitations.
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture.
* @error: a #GError or NULL.
*
* Load an image file from disk.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if creating the texture failed.
*/
CoglHandle
cogl_texture_new_from_file (const gchar *filename,
gint max_waste,
CoglPixelFormat internal_format,
GError **error);
/**
* cogl_texture_new_from_data:
* @width: width of texture in pixels.
* @height: height of texture in pixels.
* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
* @format: the #CoglPixelFormat the buffer is stored in in RAM
* @internal_format: the #CoglPixelFormat that will be used for storing the
* buffer on the GPU.
* @rowstride: the memory offset in bytes between the starts of scanlines in
* @data.
* @data: pointer the memory region where the source buffer resides.
*
* Create a new cogl texture based on data residing in memory.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if creating the texture failed.
*/
CoglHandle
cogl_texture_new_from_data (guint width,
guint height,
gint max_waste,
CoglPixelFormat format,
CoglPixelFormat internal_format,
guint rowstride,
const guchar *data);
/**
* cogl_texture_new_from_foreign:
* @gl_handle: opengl target type of foreign texture
* @gl_target: opengl handle of foreign texture.
* @width: width of foreign texture
* @height: height of foreign texture.
* @x_pot_waste: maximum horizontal waste.
* @y_pot_waste: maximum vertical waste.
* @format: format of the foreign texture.
*
* Create a cogl texture based on an existing OpenGL texture, the width, height
* and format are passed along since it is not possible to query this from a
* handle with GLES 1.0.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if creating the texture failed.
*/
CoglHandle
cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format);
/**
* cogl_is_texture:
* @handle: A CoglHandle
*
* Gets whether the given handle references an existing texture object.
*
* Returns: %TRUE if the handle references a texture,
* %FALSE otherwise
*/
gboolean
cogl_is_texture (CoglHandle handle);
/**
* cogl_texture_get_width:
* @handle: a #CoglHandle for a texture.
*
* Query the width of a cogl texture.
*
* Returns: the width of the GPU side texture in pixels:
*/
guint
cogl_texture_get_width (CoglHandle handle);
/**
* cogl_texture_get_height:
* @handle: a #CoglHandle for a texture.
*
* Query the height of a cogl texture.
*
* Returns: the height of the GPU side texture in pixels:
*/
guint
cogl_texture_get_height (CoglHandle handle);
/**
* cogl_texture_get_format:
* @handle: a #CoglHandle for a texture.
*
* Query the #CoglPixelFormat of a cogl texture.
*
* Returns: the #CoglPixelFormat of the GPU side texture.
*/
CoglPixelFormat
cogl_texture_get_format (CoglHandle handle);
/**
* cogl_texture_get_rowstride:
* @handle: a #CoglHandle for a texture.
*
* Query the rowstride of a cogl texture.
*
* Returns: the offset in bytes between each consequetive row of pixels.
*/
guint
cogl_texture_get_rowstride (CoglHandle handle);
/**
* cogl_texture_get_max_waste:
* @handle: a #CoglHandle for a texture.
*
* Query the maximum wasted (unused) pixels in one dimension of a GPU side texture.
*
* Returns: the maximum waste.
*/
gint
cogl_texture_get_max_waste (CoglHandle handle);
/**
* cogl_texture_get_min_filter:
* @handle: a #CoglHandle for a texture.
*
* Query the currently set downscaling filter for a cogl texture.
*
* Returns: the current downscaling filter for a cogl texture.
*/
COGLenum
cogl_texture_get_min_filter (CoglHandle handle);
/**
* cogl_texture_get_mag_filter:
* @handle: a #CoglHandle for a texture.
*
* Query the currently set downscaling filter for a cogl texture.
*
* Returns: the current downscaling filter for a cogl texture.
*/
COGLenum
cogl_texture_get_mag_filter (CoglHandle handle);
/**
* cogl_texture_is_sliced:
* @handle: a #CoglHandle for a texture.
*
* Query if a texture is sliced (stored as multiple GPU side tecture
* objects).
*
* Returns: %TRUE if the texture is sliced, %FALSE if the texture
* is stored as a single GPU texture.
*/
gboolean
cogl_texture_is_sliced (CoglHandle handle);
/**
* cogl_texture_get_gl_texture:
* @handle: a #CoglHandle for a texture.
* @out_gl_handle: pointer to return location for the textures GL handle, or
* NULL.
* @out_gl_target: pointer to return location for the GL target type, or NULL.
*
* Query the GL handles for a GPU side texture through it's #CoglHandle,
* if the texture is spliced the data for the first sub texture will be
* queried.
*
* Returns: %TRUE if the handle was successfully retrieved %FALSE
* if the handle was invalid.
*/
gboolean
cogl_texture_get_gl_texture (CoglHandle handle,
GLuint *out_gl_handle,
GLenum *out_gl_target);
/**
* cogl_texture_get_data:
* @handle: a #CoglHandle for a texture.
* @format: the #CoglPixelFormat to store the texture as.
* @rowstride: the rowstride of @data or retrieved from texture if none is
* specified.
* @data: memory location to write contents of buffer, or %NULL if we're
* only querying the data size through the return value.
*
* Copy the pixel data from a cogl texture to system memory.
*
* Returns: the size of the texture data in bytes (or 0 if the texture
* is not valid.)
*/
gint
cogl_texture_get_data (CoglHandle handle,
CoglPixelFormat format,
guint rowstride,
guchar *data);
/**
* cogl_texture_set_filters:
* @handle: a #CoglHandle.
* @min_filter: the filter used when scaling the texture down.
* @mag_filter: the filter used when magnifying the texture.
*
* Changes the decimation and interpolation filters used when the texture is
* drawn at other scales than 100%.
*/
void
cogl_texture_set_filters (CoglHandle handle,
COGLenum min_filter,
COGLenum mag_filter);
/**
* cogl_texture_set_region:
* @handle: a #CoglHandle.
* @src_x: upper left coordinate to use from source data.
* @src_y: upper left coordinate to use from source data.
* @dst_x: upper left destination horizontal coordinate.
* @dst_y: upper left destination vertical coordinate.
* @dst_width: width of destination region to write.
* @dst_height: height of destination region to write.
* @width: width of source data buffer.
* @height: height of source data buffer.
* @format: the #CoglPixelFormat used in the source buffer.
* @rowstride: rowstride of source buffer (computed from width if none specified)
* @data: the actual pixel data.
*
* Sets the pixels in a rectangular subregion of @handle from an in-memory buffer
* containing pixel data.
*
* Returns: %TRUE if the subregion upload was successful, otherwise %FALSE.
*/
gboolean
cogl_texture_set_region (CoglHandle handle,
gint src_x,
gint src_y,
gint dst_x,
gint dst_y,
guint dst_width,
guint dst_height,
gint width,
gint height,
CoglPixelFormat format,
guint rowstride,
const guchar *data);
/**
* cogl_texture_ref:
* @handle: a @CoglHandle.
*
* Increment the reference count for a cogl.
*
* Returns: the @handle.
*/
CoglHandle
cogl_texture_ref (CoglHandle handle);
/**
* cogl_texture_unref:
* @handle: a @CoglHandle.
*
* Deccrement the reference count for a cogl texture.
*/
void
cogl_texture_unref (CoglHandle handle);
/**
* cogl_texture_rectangle:
* @handle: a @CoglHandle.
* @x1: x coordinate upper left on screen.
* @y1: y coordinate upper left on screen.
* @x2: x coordinate lower right on screen.
* @y2: y coordinate lower right on screen.
* @tx1: x part of texture coordinate to use for upper left pixel
* @ty1: y part of texture coordinate to use for upper left pixel
* @tx2: x part of texture coordinate to use for lower right pixel
* @ty2: y part of texture coordinate to use for left pixel
*
* Draw a rectangle from a texture to the display, to draw the entire
* texture pass in @tx1=0.0 @ty1=0.0 @tx2=1.0 @ty2=1.0.
*/
void
cogl_texture_rectangle (CoglHandle handle,
ClutterFixed x1,
ClutterFixed y1,
ClutterFixed x2,
ClutterFixed y2,
ClutterFixed tx1,
ClutterFixed ty1,
ClutterFixed tx2,
ClutterFixed ty2);
/**
* cogl_texture_polygon:
* @handle: A CoglHandle for a texture
* @n_vertices: The length of the vertices array
* @vertices: An array of #CoglTextureVertex structs
* @use_color: %TRUE if the color member of #CoglTextureVertex should be used
*
* Draws a polygon from a texture with the given model and texture
* coordinates. This can be used to draw arbitrary shapes textured
* with a COGL texture. If @use_color is %TRUE then the current COGL
* color will be changed for each vertex using the value specified in
* the color member of #CoglTextureVertex. This can be used for
* example to make the texture fade out by setting the alpha value of
* the color.
*
* All of the texture coordinates must be in the range [0,1] and
* repeating the texture is not supported.
*
* Because of the way this function is implemented it will currently
* only work if either the texture is not sliced or the backend is not
* OpenGL ES and the minifying and magnifying functions are both set
* to CGL_NEAREST.
*/
void
cogl_texture_polygon (CoglHandle handle,
guint n_vertices,
CoglTextureVertex *vertices,
gboolean use_color);
/* Primitives API */
/**
* cogl_color:
* @color: new current @ClutterColor.
*
* Changes the color of cogl's current paint, which is used for filling and stroking
* primitives.
*/
void
cogl_color (const ClutterColor *color);
void
cogl_fast_fill_rectangle (gint x,
gint y,
guint width,
guint height);
void
cogl_fast_fill_rectanglex (ClutterFixed x,
ClutterFixed y,
ClutterFixed width,
ClutterFixed height);
void
cogl_fast_fill_trapezoid (gint y1,
gint x11,
gint x21,
gint y2,
gint x12,
gint x22);
void
cogl_fast_fill_trapezoidx (ClutterFixed y1,
ClutterFixed x11,
ClutterFixed x21,
ClutterFixed y2,
ClutterFixed x12,
ClutterFixed x22);
void
cogl_fill (void);
void
cogl_stroke (void);
void
cogl_path_move_to (ClutterFixed x,
ClutterFixed y);
void
cogl_path_move_to_rel (ClutterFixed x,
ClutterFixed y);
void
cogl_path_line_to (ClutterFixed x,
ClutterFixed y);
void
cogl_path_line_to_rel (ClutterFixed x,
ClutterFixed y);
void
cogl_path_h_line_to (ClutterFixed x);
void
cogl_path_v_line_to (ClutterFixed y);
void
cogl_path_h_line_to_rel (ClutterFixed x);
void
cogl_path_v_line_to_rel (ClutterFixed y);
void
cogl_path_arc (ClutterFixed center_x,
ClutterFixed center_y,
ClutterFixed radius_x,
ClutterFixed radius_y,
ClutterAngle angle_1,
ClutterAngle angle_2,
ClutterAngle angle_step);
void
cogl_path_arc_rel (ClutterFixed center_x,
ClutterFixed center_y,
ClutterFixed radius_x,
ClutterFixed radius_y,
ClutterAngle angle_1,
ClutterAngle angle_2,
ClutterAngle angle_step);
void
cogl_path_bezier2_to (ClutterFixed x1,
ClutterFixed y1,
ClutterFixed x2,
ClutterFixed y2);
void
cogl_path_bezier2_to_rel (ClutterFixed x1,
ClutterFixed y1,
ClutterFixed x2,
ClutterFixed y2);
void
cogl_path_bezier3_to (ClutterFixed x1,
ClutterFixed y1,
ClutterFixed x2,
ClutterFixed y2,
ClutterFixed x3,
ClutterFixed y3);
void
cogl_path_bezier3_to_rel (ClutterFixed x1,
ClutterFixed y1,
ClutterFixed x2,
ClutterFixed y2,
ClutterFixed x3,
ClutterFixed y3);
void
cogl_path_close (void);
void
cogl_line (ClutterFixed x1,
ClutterFixed y1,
ClutterFixed x2,
ClutterFixed y2);
void
cogl_polyline (ClutterFixed *coords,
gint num_points);
void
cogl_polygon (ClutterFixed *coords,
gint num_points);
void
cogl_rectangle (ClutterFixed x,
ClutterFixed y,
ClutterFixed width,
ClutterFixed height);
void
cogl_arc (ClutterFixed center_x,
ClutterFixed center_y,
ClutterFixed radius_x,
ClutterFixed radius_y,
ClutterAngle angle_1,
ClutterAngle angle_2,
ClutterAngle angle_step);
void
cogl_ellipse (ClutterFixed center_x,
ClutterFixed center_y,
ClutterFixed radius_x,
ClutterFixed radius_y,
ClutterAngle angle_step);
void
cogl_round_rectangle (ClutterFixed x,
ClutterFixed y,
ClutterFixed width,
ClutterFixed height,
ClutterFixed radius,
ClutterAngle arc_step);
/**
* cogl_create_shader:
* @shaderType: CGL_VERTEX_SHADER og CGL_FRAGMENT_SHADER.
*
* Create a new shader handle, use #cogl_shader_source to set the source code
* to be used on it.
*
* Returns: a new shader handle.
*/
COGLhandle
cogl_create_shader (COGLenum shaderType);
/**
* cogl_shader_destroy:
* @handle: #COGLhandle for a shader.
*
* Free up the resources used by a cogl shader.
*/
void
cogl_shader_destroy (COGLhandle handle);
/**
* cogl_shader_source:
* @shader: #COGLhandle for a shader.
* @source: GLSL shader source.
*
* Replaces the current GLSL source associated with a shader with a new
* one.
*/
void
cogl_shader_source (COGLhandle shader,
const gchar *source);
/**
* cogl_shader_compile:
* @shader_handle: #COGLhandle for a shader.
*
* Compiles the shader, no return value, but the shader is now ready for
* linking into a program.
*/
void
cogl_shader_compile (COGLhandle shader_handle);
/**
* cogl_shader_get_info_log:
* @handle: #COGLhandle for a shader.
* @size: maximum number of bytes to retrieve.
* @buffer: location for info log.
*
* Retrieves the information log for a coglobject, can be used in conjunction
* with #cogl_shader_get_parameteriv to retrieve the compiler warnings/error
* messages that caused a shader to not compile correctly, mainly useful for
* debugging purposes.
*/
void
cogl_shader_get_info_log (COGLhandle handle,
guint size,
gchar *buffer);
/**
* cogl_shader_get_parameteriv:
* @handle: #COGLhandle for a shader.
* @pname: the named COGL parameter to retrieve.
* @dest: storage location for COGLint return value.
*
* Retrieve a named parameter from a shader can be used to query to compile
* satus of a shader by passing in CGL_OBJECT_COMPILE_STATUS for @pname.
*/
void
cogl_shader_get_parameteriv (COGLhandle handle,
COGLenum pname,
COGLint *dest);
/**
* cogl_create_program:
*
* Create a new cogl program object that can be used to replace parts of the GL
* rendering pipeline with custom code.
*
* Returns: a new cogl program.
*/
COGLhandle
cogl_create_program (void);
/**
* cogl_program_destroy:
* @handle: #COGLhandle for a shader.
*
* Releases all resources held by a cogl program.
*/
void
cogl_program_destroy (COGLhandle handle);
/**
* cogl_program_attach_shader:
* @program_handle: a #COGLhandle for a shdaer program.
* @shader_handle: a #COGLhandle for a vertex of fragment shader.
*
* Attaches a shader to a program object, a program can have one vertex shader
* and one fragment shader attached.
*/
void
cogl_program_attach_shader (COGLhandle program_handle,
COGLhandle shader_handle);
/**
* cogl_program_link:
* @program_handle: a #COGLhandle for a shader program.
*
* Links a program making it ready for use.
*/
void
cogl_program_link (COGLhandle program_handle);
/**
* cogl_program_use:
* @program_handle: a #COGLhandle for a shader program or 0.
*
* Activate a specific shader program replacing that part of the GL rendering
* pipeline, if passed in 0 the default behavior of GL is reinstated.
*/
void
cogl_program_use (COGLhandle program_handle);
/**
* cogl_program_get_uniform_location:
* @program_handle: a #COGLhandle for a shader program.
* @uniform_name: the name of a uniform.
*
* Retrieve the location (offset) of a uniform variable in a shader program, a
* uniform is a variable that is constant for all vertices/fragments for a
* shader object and is possible to modify as an external parameter.
*
* Returns: the offset of a uniform in a specified program, this uniform can be set
* using #cogl_program_uniform_1f when the program is in use.
*/
COGLint
cogl_program_get_uniform_location (COGLhandle program_handle,
const gchar *uniform_name);
/**
* cogl_program_uniform_1f:
* @uniform_no: the unform to set.
* @value: the new value of the uniform.
*
* Changes the value of a uniform in the currently used (see #cogl_program_use)
* shader program.
*/
void
cogl_program_uniform_1f (COGLint uniform_no,
gfloat value);
/* Offscreen api */
/**
* cogl_offscreen_new_to_texture:
* @texhandle:
*
* Returns:
*/
CoglHandle
cogl_offscreen_new_to_texture (CoglHandle texhandle);
/**
* cogl_offscreen_new_multisample:
*
*
* Returns:
*/
CoglHandle
cogl_offscreen_new_multisample (void);
/**
* cogl_offscreen_ref:
* @handle:
*
* Returns:
*/
CoglHandle
cogl_offscreen_ref (CoglHandle handle);
/**
* cogl_offscreen_unref:
* @handle:
*
*/
void
cogl_offscreen_unref (CoglHandle handle);
/**
* cogl_offscreen_blit:
* @src_buffer:
* @dst_buffer:
*
*/
void
cogl_offscreen_blit (CoglHandle src_buffer,
CoglHandle dst_buffer);
/**
* cogl_offscreen_blit_region:
* @src_buffer:
* @dst_buffer:
* @src_x:
* @src_y:
* @src_w:
* @src_h:
* @dst_x:
* @dst_y:
* @dst_w:
* @dst_h:
*
*/
void
cogl_offscreen_blit_region (CoglHandle src_buffer,
CoglHandle dst_buffer,
int src_x,
int src_y,
int src_w,
int src_h,
int dst_x,
int dst_y,
int dst_w,
int dst_h);
/**
* cogl_draw_buffer:
* @target:
* @offscreen:
*
*/
void
cogl_draw_buffer (CoglBufferTarget target, CoglHandle offscreen);
G_END_DECLS
#endif /* __COGL_H__ */
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