rayzor

annotate src/min3d.c @ 0:2a5340a6eee4

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rayzor first commit
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 05 Apr 2014 08:46:27 +0300
parents
children a826bf0fb169
rev   line source
nuclear@0 1 #include <stdlib.h>
nuclear@0 2 #include "min3d.h"
nuclear@0 3 #include "m3dimpl.h"
nuclear@0 4
nuclear@0 5 #ifndef M_PI
nuclear@0 6 #define M_PI 3.141592653
nuclear@0 7 #endif
nuclear@0 8
nuclear@0 9 int m3d_init(void)
nuclear@0 10 {
nuclear@0 11 if(!(m3dctx = malloc(sizeof *m3dctx))) {
nuclear@0 12 return -1;
nuclear@0 13 }
nuclear@0 14 memset(m3dctx, 0, sizeof *m3dctx);
nuclear@0 15
nuclear@0 16 m3d_matrix_mode(M3D_PROJECTION);
nuclear@0 17 m3d_load_identity();
nuclear@0 18 m3d_matrix_mode(M3D_MODELVIEW);
nuclear@0 19 m3d_load_identity();
nuclear@0 20 return 0;
nuclear@0 21 }
nuclear@0 22
nuclear@0 23 void m3d_shutdown(void)
nuclear@0 24 {
nuclear@0 25 free(m3dctx);
nuclear@0 26 }
nuclear@0 27
nuclear@0 28 void m3d_set_buffers(struct m3d_image *cbuf, uint16_t *zbuf)
nuclear@0 29 {
nuclear@0 30 m3dctx->cbuf = cbuf;
nuclear@0 31 m3dctx->zbuf = zbuf;
nuclear@0 32 }
nuclear@0 33
nuclear@0 34 void m3d_clear(unsigned int bmask)
nuclear@0 35 {
nuclear@0 36 int num_pixels = m3dctx->cbuf->xsz * m3dctx->cbuf->ysz;
nuclear@0 37 if(bmask & M3D_COLOR_BUFFER_BIT) {
nuclear@0 38 memset(m3dctx->cbuf->pixels, 0, num_pixels * 3);
nuclear@0 39 }
nuclear@0 40 if(bmask & M3D_DEPTH_BUFFER_BIT) {
nuclear@0 41 memset(m3dctx->zbuf, 0xff, num_pixels * sizeof *m3dctx->zbuf);
nuclear@0 42 }
nuclear@0 43 }
nuclear@0 44
nuclear@0 45
nuclear@0 46 void m3d_enable(int bit)
nuclear@0 47 {
nuclear@0 48 m3dctx->state |= (1 << bit);
nuclear@0 49 }
nuclear@0 50
nuclear@0 51 void m3d_disable(int bit)
nuclear@0 52 {
nuclear@0 53 m3dctx->state &= ~(1 << bit);
nuclear@0 54 }
nuclear@0 55
nuclear@0 56
nuclear@0 57 /* matrix stack */
nuclear@0 58 void m3d_matrix_mode(int mode)
nuclear@0 59 {
nuclear@0 60 m3dctx->mmode = mode;
nuclear@0 61 }
nuclear@0 62
nuclear@0 63 void m3d_load_identity(void)
nuclear@0 64 {
nuclear@0 65 static const float mid[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
nuclear@0 66 m3d_load_matrix(mid);
nuclear@0 67 }
nuclear@0 68
nuclear@0 69 void m3d_load_matrix(const float *m)
nuclear@0 70 {
nuclear@0 71 int top = m3dctx->mstack[m3dctx->mmode].top;
nuclear@0 72 memcpy(m3dctx->mstack[m3dctx->mmode].m[top], m, 16 * sizeof *m);
nuclear@0 73 }
nuclear@0 74
nuclear@0 75 #define M(i,j) (((i) << 2) + (j))
nuclear@0 76 void m3d_mult_matrix(const float *m2)
nuclear@0 77 {
nuclear@0 78 int i, j, top = m3dctx->mstack[m3dctx->mmode].top;
nuclear@0 79 float m1[16];
nuclear@0 80 float *dest = m3dctx->mstack[m3dctx->mmode].m[top];
nuclear@0 81
nuclear@0 82 memcpy(m1, dest, sizeof m1);
nuclear@0 83
nuclear@0 84 for(i=0; i<4; i++) {
nuclear@0 85 for(j=0; j<4; j++) {
nuclear@0 86 dest[M(i,j)] = m1[M(0,j)] * m2[M(i,0)] +
nuclear@0 87 m1[M(1,j)] * m2[M(i,1)] +
nuclear@0 88 m1[M(2,j)] * m2[M(i,2)] +
nuclear@0 89 m1[M(3,j)] * m2[M(i,3)];
nuclear@0 90 }
nuclear@0 91 }
nuclear@0 92 }
nuclear@0 93
nuclear@0 94 void m3d_translate(float x, float y, float z)
nuclear@0 95 {
nuclear@0 96 float m[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
nuclear@0 97 m[12] = x;
nuclear@0 98 m[13] = y;
nuclear@0 99 m[14] = z;
nuclear@0 100 m3d_mult_matrix(m);
nuclear@0 101 }
nuclear@0 102
nuclear@0 103 void m3d_rotate(float deg, float x, float y, float z)
nuclear@0 104 {
nuclear@0 105 float xform[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
nuclear@0 106
nuclear@0 107 float angle = M_PI * deg / 180.0f;
nuclear@0 108 float sina = sin(angle);
nuclear@0 109 float cosa = cos(angle);
nuclear@0 110 float one_minus_cosa = 1.0f - cosa;
nuclear@0 111 float nxsq = x * x;
nuclear@0 112 float nysq = y * y;
nuclear@0 113 float nzsq = z * z;
nuclear@0 114
nuclear@0 115 xform[0] = nxsq + (1.0f - nxsq) * cosa;
nuclear@0 116 xform[4] = x * y * one_minus_cosa - z * sina;
nuclear@0 117 xform[8] = x * z * one_minus_cosa + y * sina;
nuclear@0 118 xform[1] = x * y * one_minus_cosa + z * sina;
nuclear@0 119 xform[5] = nysq + (1.0 - nysq) * cosa;
nuclear@0 120 xform[9] = y * z * one_minus_cosa - x * sina;
nuclear@0 121 xform[2] = x * z * one_minus_cosa - y * sina;
nuclear@0 122 xform[6] = y * z * one_minus_cosa + x * sina;
nuclear@0 123 xform[10] = nzsq + (1.0 - nzsq) * cosa;
nuclear@0 124
nuclear@0 125 m3d_mult_matrix(xform);
nuclear@0 126 }
nuclear@0 127
nuclear@0 128 void m3d_scale(float x, float y, float z)
nuclear@0 129 {
nuclear@0 130 static float m[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
nuclear@0 131 m[0] = x;
nuclear@0 132 m[5] = y;
nuclear@0 133 m[10] = z;
nuclear@0 134 m3d_mult_matrix(m);
nuclear@0 135 }
nuclear@0 136
nuclear@0 137 void m3d_frustum(float left, float right, float bottom, float top, float nr, float fr)
nuclear@0 138 {
nuclear@0 139 float xform[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
nuclear@0 140
nuclear@0 141 float dx = right - left;
nuclear@0 142 float dy = top - bottom;
nuclear@0 143 float dz = fr - nr;
nuclear@0 144
nuclear@0 145 float a = (right + left) / dx;
nuclear@0 146 float b = (top + bottom) / dy;
nuclear@0 147 float c = -(fr + nr) / dz;
nuclear@0 148 float d = -2.0 * fr * nr / dz;
nuclear@0 149
nuclear@0 150 xform[0] = 2.0 * nr / dx;
nuclear@0 151 xform[5] = 2.0 * nr / dy;
nuclear@0 152 xform[8] = a;
nuclear@0 153 xform[9] = b;
nuclear@0 154 xform[10] = c;
nuclear@0 155 xform[11] = -1.0f;
nuclear@0 156 xform[14] = d;
nuclear@0 157
nuclear@0 158 m3d_mult_matrix(xform);
nuclear@0 159 }
nuclear@0 160
nuclear@0 161 void m3d_perspective(float vfov, float aspect, float nr, float fr)
nuclear@0 162 {
nuclear@0 163 float vfov_rad = M_PI * vfov / 180.0;
nuclear@0 164 float x = nr * tan(vfov_rad / 2.0);
nuclear@0 165 m3d_frustum(-aspect * x, aspect * x, -x, x, nr, fr);
nuclear@0 166 }
nuclear@0 167
nuclear@0 168 /* drawing */
nuclear@0 169 void m3d_draw(int prim, const float *varr, int vcount)
nuclear@0 170 {
nuclear@0 171 /* TODO */
nuclear@0 172 }
nuclear@0 173
nuclear@0 174 void m3d_draw_indexed(int prim, const float *varr, const int *idxarr, int icount)
nuclear@0 175 {
nuclear@0 176 /* TODO */
nuclear@0 177 }
nuclear@0 178