93754d8dc0
Protect the people using a C++ compiler from the dark abyss of C code. http://bugzilla.openedhand.com/show_bug.cgi?id=2049
190 lines
6.8 KiB
C
190 lines
6.8 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) 2007,2008,2009 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_PRIMITIVES_H
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#define __COGL_PRIMITIVES_H
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#include <glib.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-primitives
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* @short_description: Functions that draw various primitive 3D shapes
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*
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* The primitives API provides utilities for drawing some
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* common 3D shapes in a more convenient way than the CoglVertexBuffer
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* API provides.
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*/
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/**
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* cogl_rectangle:
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* @x_1: X coordinate of the top-left corner
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* @y_1: Y coordinate of the top-left corner
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* @x_2: X coordinate of the bottom-right corner
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* @y_2: Y coordinate of the bottom-right corner
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*
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* Fills a rectangle at the given coordinates with the current source material
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**/
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void
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cogl_rectangle (float x_1,
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float y_1,
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float x_2,
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float y_2);
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/**
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* cogl_rectangle_with_texture_coords:
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* @x1: x coordinate upper left on screen.
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* @y1: y coordinate upper left on screen.
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* @x2: x coordinate lower right on screen.
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* @y2: y coordinate lower right on screen.
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* @tx1: x part of texture coordinate to use for upper left pixel
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* @ty1: y part of texture coordinate to use for upper left pixel
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* @tx2: x part of texture coordinate to use for lower right pixel
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* @ty2: y part of texture coordinate to use for left pixel
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*
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* Draw a rectangle using the current material and supply texture coordinates
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* to be used for the first texture layer of the material. To draw the entire
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* texture pass in @tx1=0.0 @ty1=0.0 @tx2=1.0 @ty2=1.0.
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*
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* Since: 1.0
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*/
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void
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cogl_rectangle_with_texture_coords (float x1,
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float y1,
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float x2,
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float y2,
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float tx1,
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float ty1,
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float tx2,
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float ty2);
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/**
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* cogl_rectangle_with_multitexture_coords:
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* @x1: x coordinate upper left on screen.
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* @y1: y coordinate upper left on screen.
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* @x2: x coordinate lower right on screen.
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* @y2: y coordinate lower right on screen.
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* @tex_coords: (in) (array) (transfer none): An array containing groups of
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* 4 float values: [tx1, ty1, tx2, ty2] that are interpreted as two texture
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* coordinates; one for the upper left texel, and one for the lower right
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* texel. Each value should be between 0.0 and 1.0, where the coordinate
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* (0.0, 0.0) represents the top left of the texture, and (1.0, 1.0) the
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* bottom right.
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* @tex_coords_len: The length of the tex_coords array. (e.g. for one layer
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* and one group of texture coordinates, this would be 4)
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*
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* This function draws a rectangle using the current source material to
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* texture or fill with. As a material may contain multiple texture layers
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* this interface lets you supply texture coordinates for each layer of the
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* material.
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*
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* The first pair of coordinates are for the first layer (with the smallest
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* layer index) and if you supply less texture coordinates than there are
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* layers in the current source material then default texture coordinates
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* (0.0, 0.0, 1.0, 1.0) are generated.
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*
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* Since: 1.0
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*/
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void
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cogl_rectangle_with_multitexture_coords (float x1,
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float y1,
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float x2,
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float y2,
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const float *tex_coords,
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int tex_coords_len);
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/**
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* cogl_rectangles_with_texture_coords:
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* @verts: (in) (array) (transfer none): an array of vertices
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* @n_rects: number of rectangles to draw
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*
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* Draws a series of rectangles in the same way that
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* cogl_rectangle_with_texture_coords() does. In some situations it can give a
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* significant performance boost to use this function rather than
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* calling cogl_rectangle_with_texture_coords() separately for each rectangle.
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*
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* @verts should point to an array of #float<!-- -->s with
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* @n_rects * 8 elements. Each group of 8 values corresponds to the
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* parameters x1, y1, x2, y2, tx1, ty1, tx2 and ty2 and have the same
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* meaning as in cogl_rectangle_with_texture_coords().
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*
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* Since: 0.8.6
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*/
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void
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cogl_rectangles_with_texture_coords (const float *verts,
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unsigned int n_rects);
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/**
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* cogl_rectangles:
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* @verts: (in) (array) (transfer none): an array of vertices
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* @n_rects: number of rectangles to draw
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*
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* Draws a series of rectangles in the same way that
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* cogl_rectangle() does. In some situations it can give a
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* significant performance boost to use this function rather than
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* calling cogl_rectangle() separately for each rectangle.
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*
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* @verts should point to an array of #float<!-- -->s with
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* @n_rects * 4 elements. Each group of 4 values corresponds to the
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* parameters x1, y1, x2, and y2, and have the same
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* meaning as in cogl_rectangle().
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*
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* Since: 1.0
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*/
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void
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cogl_rectangles (const float *verts,
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unsigned int n_rects);
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/**
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* cogl_polygon:
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* @vertices: An array of #CoglTextureVertex structs
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* @n_vertices: The length of the vertices array
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* @use_color: %TRUE if the color member of #CoglTextureVertex should be used
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*
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* Draws a convex polygon using the current source material to fill / texture
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* with according to the texture coordinates passed.
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*
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* If @use_color is %TRUE then the color will be changed for each vertex using
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* the value specified in the color member of #CoglTextureVertex. This can be
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* used for example to make the texture fade out by setting the alpha value of
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* the color.
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*
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* All of the texture coordinates must be in the range [0,1] and repeating the
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* texture is not supported.
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*
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* Because of the way this function is implemented it will currently
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* only work if either the texture is not sliced or the backend is not
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* OpenGL ES and the minifying and magnifying functions are both set
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* to COGL_MATERIAL_FILTER_NEAREST.
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*
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* Since: 1.0
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*/
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void
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cogl_polygon (const CoglTextureVertex *vertices,
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unsigned int n_vertices,
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gboolean use_color);
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G_END_DECLS
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#endif /* __COGL_PRIMITIVES_H */
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