1 /*
2 * mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /**
26 * \brief Array type draw functions, the main workhorse of any OpenGL API
27 * \author Keith Whitwell
28 */
29
30
31 #ifndef DRAW_H
32 #define DRAW_H
33
34 #include <stdbool.h>
35 #include "util/glheader.h"
36
37 #ifdef __cplusplus
38 extern "C" {
39 #endif
40
41 struct gl_context;
42 struct gl_vertex_array_object;
43 struct _mesa_prim
44 {
45 GLubyte mode; /**< GL_POINTS, GL_LINES, GL_QUAD_STRIP, etc */
46
47 /**
48 * tnl: If true, line stipple emulation will reset the pattern walker.
49 * vbo: If false and the primitive is a line loop, the first vertex is
50 * the beginning of the line loop and it won't be drawn.
51 * Instead, it will be moved to the end.
52 */
53 bool begin;
54
55 /**
56 * tnl: If true and the primitive is a line loop, it will be closed.
57 * vbo: Same as tnl.
58 */
59 bool end;
60
61 GLuint start;
62 GLuint count;
63 GLint basevertex;
64 GLuint draw_id;
65 };
66
67 /* Would like to call this a "vbo_index_buffer", but this would be
68 * confusing as the indices are not neccessarily yet in a non-null
69 * buffer object.
70 */
71 struct _mesa_index_buffer
72 {
73 GLuint count;
74 uint8_t index_size_shift; /* logbase2(index_size) */
75 struct gl_buffer_object *obj;
76 const void *ptr;
77 };
78
79
80 void
81 _mesa_set_varying_vp_inputs(struct gl_context *ctx, GLbitfield varying_inputs);
82
83 void
84 _mesa_set_draw_vao(struct gl_context *ctx, struct gl_vertex_array_object *vao);
85
86 void
87 _mesa_save_and_set_draw_vao(struct gl_context *ctx,
88 struct gl_vertex_array_object *vao,
89 GLbitfield vp_input_filter,
90 struct gl_vertex_array_object **old_vao,
91 GLbitfield *old_vp_input_filter);
92
93 void
94 _mesa_restore_draw_vao(struct gl_context *ctx,
95 struct gl_vertex_array_object *saved,
96 GLbitfield saved_vp_input_filter);
97
98 void
99 _mesa_bitmap(struct gl_context *ctx, GLsizei width, GLsizei height,
100 GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
101 const GLubyte *bitmap, struct pipe_resource *tex);
102
103 static inline unsigned
_mesa_get_index_size_shift(GLenum type)104 _mesa_get_index_size_shift(GLenum type)
105 {
106 /* The type is already validated, so use a fast conversion.
107 *
108 * GL_UNSIGNED_BYTE - GL_UNSIGNED_BYTE = 0
109 * GL_UNSIGNED_SHORT - GL_UNSIGNED_BYTE = 2
110 * GL_UNSIGNED_INT - GL_UNSIGNED_BYTE = 4
111 *
112 * Divide by 2 to get 0,1,2.
113 */
114 return (type - GL_UNSIGNED_BYTE) >> 1;
115 }
116
117 static inline bool
_mesa_is_index_type_valid(GLenum type)118 _mesa_is_index_type_valid(GLenum type)
119 {
120 /* GL_UNSIGNED_BYTE = 0x1401
121 * GL_UNSIGNED_SHORT = 0x1403
122 * GL_UNSIGNED_INT = 0x1405
123 *
124 * The trick is that bit 1 and bit 2 mean USHORT and UINT, respectively.
125 * After clearing those two bits (with ~6), we should get UBYTE.
126 * Both bits can't be set, because the enum would be greater than UINT.
127 */
128 return type <= GL_UNSIGNED_INT && (type & ~6) == GL_UNSIGNED_BYTE;
129 }
130
131 #ifdef __cplusplus
132 } // extern "C"
133 #endif
134
135 #endif
136