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annotate src/gles/sanegl.c @ 3:45b91185b298

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android port
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 01 May 2015 04:36:50 +0300
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nuclear@3 1 /*
nuclear@3 2 SaneGL - a small library to bring back sanity to OpenGL ES 2.x
nuclear@3 3 Copyright (C) 2011-2013 John Tsiombikas <nuclear@member.fsf.org>
nuclear@3 4
nuclear@3 5 This program is free software: you can redistribute it and/or modify
nuclear@3 6 it under the terms of the GNU General Public License as published by
nuclear@3 7 the Free Software Foundation, either version 3 of the License, or
nuclear@3 8 (at your option) any later version.
nuclear@3 9
nuclear@3 10 This program is distributed in the hope that it will be useful,
nuclear@3 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@3 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@3 13 GNU General Public License for more details.
nuclear@3 14
nuclear@3 15 You should have received a copy of the GNU General Public License
nuclear@3 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@3 17 */
nuclear@3 18
nuclear@3 19 #include <stdio.h>
nuclear@3 20 #include <stdlib.h>
nuclear@3 21 #include <string.h>
nuclear@3 22 #include <math.h>
nuclear@3 23 #include <assert.h>
nuclear@3 24 #include "sanegl.h"
nuclear@3 25
nuclear@3 26 #define MAX_VERTS 512
nuclear@3 27
nuclear@3 28 static void gl_draw_immediate(void);
nuclear@3 29
nuclear@3 30 typedef struct { float x, y; } vec2_t;
nuclear@3 31 typedef struct { float x, y, z; } vec3_t;
nuclear@3 32 typedef struct { float x, y, z, w; } vec4_t;
nuclear@3 33
nuclear@3 34 static int prim = -1;
nuclear@3 35
nuclear@3 36 static vec3_t cur_normal;
nuclear@3 37 static vec4_t cur_color;
nuclear@3 38 static vec2_t cur_texcoord;
nuclear@3 39
nuclear@3 40 static vec4_t *vert_arr, *col_arr;
nuclear@3 41 static vec3_t *norm_arr;
nuclear@3 42 static vec2_t *texc_arr;
nuclear@3 43
nuclear@3 44 static int num_verts, vert_calls;
nuclear@3 45
nuclear@3 46 /* immediate mode rendering */
nuclear@3 47 void gl_begin(int p)
nuclear@3 48 {
nuclear@3 49 if(!vert_arr) {
nuclear@3 50 vert_arr = malloc(MAX_VERTS * sizeof *vert_arr);
nuclear@3 51 norm_arr = malloc(MAX_VERTS * sizeof *norm_arr);
nuclear@3 52 texc_arr = malloc(MAX_VERTS * sizeof *texc_arr);
nuclear@3 53 col_arr = malloc(MAX_VERTS * sizeof *col_arr);
nuclear@3 54 assert(vert_arr && norm_arr && texc_arr && col_arr);
nuclear@3 55 }
nuclear@3 56
nuclear@3 57 prim = p;
nuclear@3 58 num_verts = vert_calls = 0;
nuclear@3 59 }
nuclear@3 60
nuclear@3 61 void gl_end(void)
nuclear@3 62 {
nuclear@3 63 if(num_verts > 0) {
nuclear@3 64 gl_draw_immediate();
nuclear@3 65 }
nuclear@3 66 }
nuclear@3 67
nuclear@3 68 static void gl_draw_immediate(void)
nuclear@3 69 {
nuclear@3 70 int glprim;
nuclear@3 71
nuclear@3 72 glprim = prim == GL_QUADS ? GL_TRIANGLES : prim;
nuclear@3 73
nuclear@3 74 glEnableClientState(GL_VERTEX_ARRAY);
nuclear@3 75 glEnableClientState(GL_NORMAL_ARRAY);
nuclear@3 76 glEnableClientState(GL_COLOR_ARRAY);
nuclear@3 77 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@3 78
nuclear@3 79 glVertexPointer(4, GL_FLOAT, 0, vert_arr);
nuclear@3 80 glNormalPointer(GL_FLOAT, 0, norm_arr);
nuclear@3 81 glColorPointer(4, GL_FLOAT, 0, col_arr);
nuclear@3 82 glTexCoordPointer(2, GL_FLOAT, 0, texc_arr);
nuclear@3 83
nuclear@3 84 glDrawArrays(glprim, 0, num_verts);
nuclear@3 85
nuclear@3 86 glDisableClientState(GL_VERTEX_ARRAY);
nuclear@3 87 glDisableClientState(GL_NORMAL_ARRAY);
nuclear@3 88 glDisableClientState(GL_COLOR_ARRAY);
nuclear@3 89 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
nuclear@3 90 }
nuclear@3 91
nuclear@3 92 void gl_vertex2f(float x, float y)
nuclear@3 93 {
nuclear@3 94 gl_vertex4f(x, y, 0.0f, 1.0f);
nuclear@3 95 }
nuclear@3 96
nuclear@3 97 void gl_vertex3f(float x, float y, float z)
nuclear@3 98 {
nuclear@3 99 gl_vertex4f(x, y, z, 1.0f);
nuclear@3 100 }
nuclear@3 101
nuclear@3 102 void gl_vertex4f(float x, float y, float z, float w)
nuclear@3 103 {
nuclear@3 104 int i, buffer_full;
nuclear@3 105
nuclear@3 106 if(prim == GL_QUADS && vert_calls % 4 == 3) {
nuclear@3 107 for(i=0; i<2; i++) {
nuclear@3 108 col_arr[num_verts] = col_arr[num_verts - 3 + i];
nuclear@3 109 texc_arr[num_verts] = texc_arr[num_verts - 3 + i];
nuclear@3 110 norm_arr[num_verts] = norm_arr[num_verts - 3 + i];
nuclear@3 111 vert_arr[num_verts] = vert_arr[num_verts - 3 + i];
nuclear@3 112 num_verts++;
nuclear@3 113 }
nuclear@3 114 }
nuclear@3 115
nuclear@3 116 vert_arr[num_verts].x = x;
nuclear@3 117 vert_arr[num_verts].y = y;
nuclear@3 118 vert_arr[num_verts].z = z;
nuclear@3 119 vert_arr[num_verts].w = w;
nuclear@3 120
nuclear@3 121 col_arr[num_verts] = cur_color;
nuclear@3 122 norm_arr[num_verts] = cur_normal;
nuclear@3 123 texc_arr[num_verts] = cur_texcoord;
nuclear@3 124
nuclear@3 125 vert_calls++;
nuclear@3 126 num_verts++;
nuclear@3 127
nuclear@3 128 if(prim == GL_QUADS) {
nuclear@3 129 /* leave space for 6 more worst-case and don't allow flushes mid-quad */
nuclear@3 130 buffer_full = num_verts >= MAX_VERTS - 6 && vert_calls % 4 == 0;
nuclear@3 131 } else {
nuclear@3 132 buffer_full = num_verts >= MAX_VERTS - prim;
nuclear@3 133 }
nuclear@3 134
nuclear@3 135 if(buffer_full) {
nuclear@3 136 gl_draw_immediate();
nuclear@3 137 gl_begin(prim); /* reset everything */
nuclear@3 138 }
nuclear@3 139 }
nuclear@3 140
nuclear@3 141
nuclear@3 142 void gl_normal3f(float x, float y, float z)
nuclear@3 143 {
nuclear@3 144 cur_normal.x = x;
nuclear@3 145 cur_normal.y = y;
nuclear@3 146 cur_normal.z = z;
nuclear@3 147 }
nuclear@3 148
nuclear@3 149
nuclear@3 150 void gl_color3f(float r, float g, float b)
nuclear@3 151 {
nuclear@3 152 cur_color.x = r;
nuclear@3 153 cur_color.y = g;
nuclear@3 154 cur_color.z = b;
nuclear@3 155 cur_color.w = 1.0f;
nuclear@3 156 }
nuclear@3 157
nuclear@3 158 void gl_color4f(float r, float g, float b, float a)
nuclear@3 159 {
nuclear@3 160 cur_color.x = r;
nuclear@3 161 cur_color.y = g;
nuclear@3 162 cur_color.z = b;
nuclear@3 163 cur_color.w = a;
nuclear@3 164 }
nuclear@3 165
nuclear@3 166
nuclear@3 167 void gl_texcoord1f(float s)
nuclear@3 168 {
nuclear@3 169 cur_texcoord.x = s;
nuclear@3 170 cur_texcoord.y = 0.0f;
nuclear@3 171 }
nuclear@3 172
nuclear@3 173 void gl_texcoord2f(float s, float t)
nuclear@3 174 {
nuclear@3 175 cur_texcoord.x = s;
nuclear@3 176 cur_texcoord.y = t;
nuclear@3 177 }
nuclear@3 178
nuclear@3 179 void glu_perspective(float fov, float aspect, float nearz, float farz)
nuclear@3 180 {
nuclear@3 181 float fovrad = M_PI * fov / 180.0;
nuclear@3 182 float halfsz = tan(fovrad) * nearz;
nuclear@3 183
nuclear@3 184 glFrustumf(-halfsz * aspect, halfsz * aspect, -halfsz, halfsz, nearz, farz);
nuclear@3 185 }