/* * Cogl * * An object oriented GL/GLES Abstraction/Utility Layer * * Copyright (C) 2007,2008,2009 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, see . * * */ #ifndef __COGL_PRIMITIVES_H #define __COGL_PRIMITIVES_H /** * SECTION:cogl-primitives * @short_description: Functions that draw various primitive 3D shapes * * The primitives API provides utilities for drawing some * common 3D shapes in a more convenient way than the CoglVertexBuffer * API provides. */ /** * cogl_rectangle: * @x_1: X coordinate of the top-left corner * @y_1: Y coordinate of the top-left corner * @x_2: X coordinate of the bottom-right corner * @y_2: Y coordinate of the bottom-right corner * * Fills a rectangle at the given coordinates with the current source material **/ void cogl_rectangle (float x_1, float y_1, float x_2, float y_2); /** * cogl_rectangle_with_texture_coords: * @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 using the current material and supply texture coordinates * to be used for the first texture layer of the material. To draw the entire * texture pass in @tx1=0.0 @ty1=0.0 @tx2=1.0 @ty2=1.0. * * Since: 1.0 */ void cogl_rectangle_with_texture_coords (float x1, float y1, float x2, float y2, float tx1, float ty1, float tx2, float ty2); /** * cogl_rectangle_with_multitexture_coords: * @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. * @tex_coords: (in) (array) (transfer none): An array containing groups of * 4 float values: [tx1, ty1, tx2, ty2] that are interpreted as two texture * coordinates; one for the upper left texel, and one for the lower right * texel. Each value should be between 0.0 and 1.0, where the coordinate * (0.0, 0.0) represents the top left of the texture, and (1.0, 1.0) the * bottom right. * @tex_coords_len: The length of the tex_coords array. (e.g. for one layer * and one group of texture coordinates, this would be 4) * * This function draws a rectangle using the current source material to * texture or fill with. As a material may contain multiple texture layers * this interface lets you supply texture coordinates for each layer of the * material. * * The first pair of coordinates are for the first layer (with the smallest * layer index) and if you supply less texture coordinates than there are * layers in the current source material then default texture coordinates * (0.0, 0.0, 1.0, 1.0) are generated. * * Since: 1.0 */ void cogl_rectangle_with_multitexture_coords (float x1, float y1, float x2, float y2, const float *tex_coords, int tex_coords_len); /** * cogl_rectangles_with_texture_coords: * @verts: (in) (array) (transfer none): an array of vertices * @n_rects: number of rectangles to draw * * Draws a series of rectangles in the same way that * cogl_rectangle_with_texture_coords() does. In some situations it can give a * significant performance boost to use this function rather than * calling cogl_rectangle_with_texture_coords() separately for each rectangle. * * @verts should point to an array of #floats with * @n_rects * 8 elements. Each group of 8 values corresponds to the * parameters x1, y1, x2, y2, tx1, ty1, tx2 and ty2 and have the same * meaning as in cogl_rectangle_with_texture_coords(). * * Since: 0.8.6 */ void cogl_rectangles_with_texture_coords (const float *verts, unsigned int n_rects); /** * cogl_rectangles: * @verts: (in) (array) (transfer none): an array of vertices * @n_rects: number of rectangles to draw * * Draws a series of rectangles in the same way that * cogl_rectangle() does. In some situations it can give a * significant performance boost to use this function rather than * calling cogl_rectangle() separately for each rectangle. * * @verts should point to an array of #floats with * @n_rects * 4 elements. Each group of 4 values corresponds to the * parameters x1, y1, x2, and y2, and have the same * meaning as in cogl_rectangle(). * * Since: 1.0 */ void cogl_rectangles (const float *verts, unsigned int n_rects); /** * cogl_polygon: * @vertices: An array of #CoglTextureVertex structs * @n_vertices: The length of the vertices array * @use_color: %TRUE if the color member of #CoglTextureVertex should be used * * Draws a convex polygon using the current source material to fill / texture * with according to the texture coordinates passed. * * If @use_color is %TRUE then the 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 COGL_MATERIAL_FILTER_NEAREST. * * Since: 1.0 */ void cogl_polygon (const CoglTextureVertex *vertices, unsigned int n_vertices, gboolean use_color); #endif /* __COGL_PRIMITIVES_H */