1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #ifndef __GL_UTILS_H__
17 #define __GL_UTILS_H__
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 
22 #ifdef GL_API
23     #undef GL_API
24 #endif
25 #define GL_API
26 
27 #ifdef GL_APIENTRY
28     #undef GL_APIENTRY
29 #endif
30 
31 #ifdef GL_APIENTRYP
32     #undef GL_APIENTRYP
33 #endif
34 #define GL_APIENTRYP
35 
36 #ifndef ANDROID
37 #define GL_APIENTRY
38 #endif
39 
40 #include <GLES/gl.h>
41 #include <GLES/glext.h>
42 #include <GLES2/gl2.h>
43 #include <GLES2/gl2ext.h>
44 
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
49     size_t glSizeof(GLenum type);
50     size_t glUtilsParamSize(GLenum param);
51     void   glUtilsPackPointerData(unsigned char *dst, unsigned char *str,
52                            int size, GLenum type, unsigned int stride,
53                            unsigned int datalen);
54     void glUtilsWritePackPointerData(void* stream, unsigned char *src,
55                                     int size, GLenum type, unsigned int stride,
56                                     unsigned int datalen);
57     int glUtilsPixelBitSize(GLenum format, GLenum type);
58     void   glUtilsPackStrings(char *ptr, char **strings, GLint *length, GLsizei count);
59     int glUtilsCalcShaderSourceLen(char **strings, GLint *length, GLsizei count);
60 #ifdef __cplusplus
61 };
62 #endif
63 
64 namespace GLUtils {
65 
minmax(T * indices,int count,int * min,int * max)66     template <class T> void minmax(T *indices, int count, int *min, int *max) {
67         *min = -1;
68         *max = -1;
69         T *ptr = indices;
70         for (int i = 0; i < count; i++) {
71             if (*min == -1 || *ptr < *min) *min = *ptr;
72             if (*max == -1 || *ptr > *max) *max = *ptr;
73             ptr++;
74         }
75     }
76 
shiftIndices(T * indices,int count,int offset)77     template <class T> void shiftIndices(T *indices, int count,  int offset) {
78         T *ptr = indices;
79         for (int i = 0; i < count; i++) {
80             *ptr += offset;
81             ptr++;
82         }
83     }
84 
85 
shiftIndices(T * src,T * dst,int count,int offset)86     template <class T> void shiftIndices(T *src, T *dst, int count, int offset)
87     {
88         for (int i = 0; i < count; i++) {
89             *dst = *src + offset;
90             dst++;
91             src++;
92         }
93     }
94 }; // namespace GLUtils
95 #endif
96