--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+
+#include "opengl.h"
+
+#ifdef GLDEF
+#undef GLDEF
+#endif
+#include "sanegl.h"
+
+#define MMODE_IDX(x) ((x) - GL_MODELVIEW)
+#define MAT_STACK_SIZE 32
+#define MAT_IDENT {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}
+
+#define MAX_VERTS 512
+
+static void gl_draw_immediate(void);
+
+typedef struct { float x, y; } vec2_t;
+typedef struct { float x, y, z; } vec3_t;
+typedef struct { float x, y, z, w; } vec4_t;
+
+static int mm_idx = 0;
+static float mat_stack[3][MAT_STACK_SIZE][16] = {{MAT_IDENT}, {MAT_IDENT}, {MAT_IDENT}};
+static int stack_top[3];
+static float mat_mvp[16];
+static int mvp_valid;
+static int prim = -1;
+
+static vec3_t cur_normal;
+static vec4_t cur_color, cur_attrib;
+static vec2_t cur_texcoord;
+
+static vec4_t *vert_arr, *col_arr, *attr_arr;
+static vec3_t *norm_arr;
+static vec2_t *texc_arr;
+/*static unsigned int vbuf, cbuf, nbuf, tbuf, abuf;*/
+static int vloc, nloc, cloc, tloc, aloc = -1;
+
+static int num_verts, vert_calls;
+static int cur_prog;
+
+
+void gl_matrix_mode(int mm)
+{
+ mm_idx = MMODE_IDX(mm);
+}
+
+void gl_push_matrix(void)
+{
+ int top = stack_top[mm_idx];
+
+ memcpy(mat_stack[mm_idx][top + 1], mat_stack[mm_idx][top], 16 * sizeof(float));
+ stack_top[mm_idx]++;
+ mvp_valid = 0;
+}
+
+void gl_pop_matrix(void)
+{
+ stack_top[mm_idx]--;
+ mvp_valid = 0;
+}
+
+void gl_load_identity(void)
+{
+ static const float idmat[] = MAT_IDENT;
+ int top = stack_top[mm_idx];
+ float *mat = mat_stack[mm_idx][top];
+
+ memcpy(mat, idmat, sizeof idmat);
+ mvp_valid = 0;
+}
+
+void gl_load_matrixf(const float *m)
+{
+ int top = stack_top[mm_idx];
+ float *mat = mat_stack[mm_idx][top];
+
+ memcpy(mat, m, 16 * sizeof *mat);
+ mvp_valid = 0;
+}
+
+#define M(i, j) ((i << 2) + j)
+
+void gl_mult_matrixf(const float *m2)
+{
+ int i, j;
+ int top = stack_top[mm_idx];
+ float *m1 = mat_stack[mm_idx][top];
+ float res[16];
+
+ for(i=0; i<4; i++) {
+ for(j=0; j<4; j++) {
+ res[M(i,j)] = m1[M(i,0)] * m2[M(0,j)] +
+ m1[M(i,1)] * m2[M(1,j)] +
+ m1[M(i,2)] * m2[M(2,j)] +
+ m1[M(i,3)] * m2[M(3,j)];
+ }
+ }
+
+ memcpy(m1, res, sizeof res);
+ mvp_valid = 0;
+}
+
+void gl_translatef(float x, float y, float z)
+{
+ float mat[] = MAT_IDENT;
+
+ mat[12] = x;
+ mat[13] = y;
+ mat[14] = z;
+
+ gl_mult_matrixf(mat);
+}
+
+void gl_rotatef(float angle, float x, float y, float z)
+{
+ float mat[] = MAT_IDENT;
+
+ float angle_rad = M_PI * angle / 180.0;
+ float sina = sin(angle_rad);
+ float cosa = cos(angle_rad);
+ float one_minus_cosa = 1.0 - cosa;
+ float nxsq = x * x;
+ float nysq = y * y;
+ float nzsq = z * z;
+
+ mat[0] = nxsq + (1.0 - nxsq) * cosa;
+ mat[4] = x * y * one_minus_cosa - z * sina;
+ mat[8] = x * z * one_minus_cosa + y * sina;
+ mat[1] = x * y * one_minus_cosa + z * sina;
+ mat[5] = nysq + (1.0 - nysq) * cosa;
+ mat[9] = y * z * one_minus_cosa - x * sina;
+ mat[2] = x * z * one_minus_cosa - y * sina;
+ mat[6] = y * z * one_minus_cosa + x * sina;
+ mat[10] = nzsq + (1.0 - nzsq) * cosa;
+
+ gl_mult_matrixf(mat);
+}
+
+void gl_scalef(float x, float y, float z)
+{
+ float mat[] = MAT_IDENT;
+
+ mat[0] = x;
+ mat[5] = y;
+ mat[10] = z;
+
+ gl_mult_matrixf(mat);
+}
+
+void gl_ortho(float left, float right, float bottom, float top, float near, float far)
+{
+ float mat[] = MAT_IDENT;
+
+ float dx = right - left;
+ float dy = top - bottom;
+ float dz = far - near;
+
+ float tx = -(right + left) / dx;
+ float ty = -(top + bottom) / dy;
+ float tz = -(far + near) / dz;
+
+ float sx = 2.0 / dx;
+ float sy = 2.0 / dy;
+ float sz = -2.0 / dz;
+
+ mat[0] = sx;
+ mat[5] = sy;
+ mat[10] = sz;
+ mat[12] = tx;
+ mat[13] = ty;
+ mat[14] = tz;
+
+ gl_mult_matrixf(mat);
+}
+
+void gl_frustum(float left, float right, float bottom, float top, float near, float far)
+{
+ float mat[] = MAT_IDENT;
+
+ float dx = right - left;
+ float dy = top - bottom;
+ float dz = far - near;
+
+ float a = (right + left) / dx;
+ float b = (top + bottom) / dy;
+ float c = -(far + near) / dz;
+ float d = -2.0 * far * near / dz;
+
+ mat[0] = 2.0 * near / dx;
+ mat[5] = 2.0 * near / dy;
+ mat[8] = a;
+ mat[9] = b;
+ mat[10] = c;
+ mat[11] = -1.0;
+ mat[14] = d;
+
+ gl_mult_matrixf(mat);
+}
+
+void glu_perspective(float vfov, float aspect, float near, float far)
+{
+ float vfov_rad = M_PI * vfov / 180.0;
+ float x = near * tan(vfov_rad / 2.0);
+ gl_frustum(-aspect * x, aspect * x, -x, x, near, far);
+}
+
+void gl_apply_xform(unsigned int prog)
+{
+ int loc, mvidx, pidx, tidx, mvtop, ptop, ttop;
+
+ mvidx = MMODE_IDX(GL_MODELVIEW);
+ pidx = MMODE_IDX(GL_PROJECTION);
+ tidx = MMODE_IDX(GL_TEXTURE);
+
+ mvtop = stack_top[mvidx];
+ ptop = stack_top[pidx];
+ ttop = stack_top[tidx];
+
+ assert(prog);
+
+ if((loc = glGetUniformLocation(prog, "matrix_modelview")) != -1) {
+ glUniformMatrix4fv(loc, 1, 0, mat_stack[mvidx][mvtop]);
+ }
+
+ if((loc = glGetUniformLocation(prog, "matrix_projection")) != -1) {
+ glUniformMatrix4fv(loc, 1, 0, mat_stack[pidx][ptop]);
+ }
+
+ if((loc = glGetUniformLocation(prog, "matrix_texture")) != -1) {
+ glUniformMatrix4fv(loc, 1, 0, mat_stack[tidx][ttop]);
+ }
+
+ if((loc = glGetUniformLocation(prog, "matrix_normal")) != -1) {
+ float nmat[9];
+
+ nmat[0] = mat_stack[mvidx][mvtop][0];
+ nmat[1] = mat_stack[mvidx][mvtop][1];
+ nmat[2] = mat_stack[mvidx][mvtop][2];
+ nmat[3] = mat_stack[mvidx][mvtop][4];
+ nmat[4] = mat_stack[mvidx][mvtop][5];
+ nmat[5] = mat_stack[mvidx][mvtop][6];
+ nmat[6] = mat_stack[mvidx][mvtop][8];
+ nmat[7] = mat_stack[mvidx][mvtop][9];
+ nmat[8] = mat_stack[mvidx][mvtop][10];
+ glUniformMatrix3fv(loc, 1, 0, nmat);
+ }
+
+ if((loc = glGetUniformLocation(prog, "matrix_modelview_projection")) != -1) {
+ if(!mvp_valid) {
+ /* TODO calc mvp */
+ }
+ glUniformMatrix4fv(loc, 1, 0, mat_mvp);
+ }
+}
+
+
+/* immediate mode rendering */
+void gl_begin(int p)
+{
+ if(!vert_arr) {
+ vert_arr = malloc(MAX_VERTS * sizeof *vert_arr);
+ norm_arr = malloc(MAX_VERTS * sizeof *norm_arr);
+ texc_arr = malloc(MAX_VERTS * sizeof *texc_arr);
+ col_arr = malloc(MAX_VERTS * sizeof *col_arr);
+ attr_arr = malloc(MAX_VERTS * sizeof *attr_arr);
+ assert(vert_arr && norm_arr && texc_arr && col_arr && attr_arr);
+ }
+
+ prim = p;
+ num_verts = vert_calls = 0;
+
+ glGetIntegerv(GL_CURRENT_PROGRAM, &cur_prog);
+ assert(cur_prog);
+
+ gl_apply_xform(cur_prog);
+
+ vloc = glGetAttribLocation(cur_prog, "attr_vertex");
+ nloc = glGetAttribLocation(cur_prog, "attr_normal");
+ cloc = glGetAttribLocation(cur_prog, "attr_color");
+ tloc = glGetAttribLocation(cur_prog, "attr_texcoord");
+}
+
+void gl_end(void)
+{
+ if(num_verts > 0) {
+ gl_draw_immediate();
+ }
+ aloc = -1;
+}
+
+static void gl_draw_immediate(void)
+{
+ int glprim;
+
+ if(vloc == -1) {
+ fprintf(stderr, "gl_draw_immediate call with vloc == -1\n");
+ return;
+ }
+
+ glprim = prim == GL_QUADS ? GL_TRIANGLES : prim;
+
+ glVertexAttribPointer(vloc, 4, GL_FLOAT, 0, 0, vert_arr);
+ glEnableVertexAttribArray(vloc);
+
+ if(nloc != -1) {
+ glVertexAttribPointer(nloc, 3, GL_FLOAT, 0, 0, norm_arr);
+ glEnableVertexAttribArray(nloc);
+ }
+
+ if(cloc != -1) {
+ glVertexAttribPointer(cloc, 4, GL_FLOAT, 1, 0, col_arr);
+ glEnableVertexAttribArray(cloc);
+ }
+
+ if(tloc != -1) {
+ glVertexAttribPointer(tloc, 2, GL_FLOAT, 0, 0, texc_arr);
+ glEnableVertexAttribArray(tloc);
+ }
+
+ if(aloc != -1) {
+ glVertexAttribPointer(aloc, 4, GL_FLOAT, 0, 0, attr_arr);
+ glEnableVertexAttribArray(aloc);
+ }
+
+ glDrawArrays(glprim, 0, num_verts);
+
+ glDisableVertexAttribArray(vloc);
+ if(nloc != -1) {
+ glDisableVertexAttribArray(nloc);
+ }
+ if(cloc != -1) {
+ glDisableVertexAttribArray(cloc);
+ }
+ if(tloc != -1) {
+ glDisableVertexAttribArray(tloc);
+ }
+ if(aloc != -1) {
+ glDisableVertexAttribArray(aloc);
+ }
+}
+
+
+void gl_vertex2f(float x, float y)
+{
+ gl_vertex4f(x, y, 0.0f, 1.0f);
+}
+
+void gl_vertex3f(float x, float y, float z)
+{
+ gl_vertex4f(x, y, z, 1.0f);
+}
+
+void gl_vertex4f(float x, float y, float z, float w)
+{
+ int i, buffer_full;
+
+ if(prim == GL_QUADS && vert_calls % 4 == 3) {
+ for(i=0; i<2; i++) {
+ if(aloc != -1) {
+ attr_arr[num_verts] = attr_arr[num_verts - 3 + i];
+ }
+ if(cloc != -1) {
+ col_arr[num_verts] = col_arr[num_verts - 3 + i];
+ }
+ if(tloc != -1) {
+ texc_arr[num_verts] = texc_arr[num_verts - 3 + i];
+ }
+ if(nloc != -1) {
+ norm_arr[num_verts] = norm_arr[num_verts - 3 + i];
+ }
+ vert_arr[num_verts] = vert_arr[num_verts - 3 + i];
+ num_verts++;
+ }
+ }
+
+ vert_arr[num_verts].x = x;
+ vert_arr[num_verts].y = y;
+ vert_arr[num_verts].z = z;
+ vert_arr[num_verts].w = w;
+
+ if(cloc != -1) {
+ col_arr[num_verts] = cur_color;
+ }
+ if(nloc != -1) {
+ norm_arr[num_verts] = cur_normal;
+ }
+ if(tloc != -1) {
+ texc_arr[num_verts] = cur_texcoord;
+ }
+ if(aloc != -1) {
+ attr_arr[num_verts] = cur_attrib;
+ }
+
+ vert_calls++;
+ num_verts++;
+
+ if(prim == GL_QUADS) {
+ /* leave space for 6 more worst-case and don't allow flushes mid-quad */
+ buffer_full = num_verts >= MAX_VERTS - 6 && vert_calls % 4 == 0;
+ } else {
+ buffer_full = num_verts >= MAX_VERTS - prim;
+ }
+
+ if(buffer_full) {
+ gl_draw_immediate();
+ gl_begin(prim); /* reset everything */
+ }
+}
+
+
+void gl_normal3f(float x, float y, float z)
+{
+ cur_normal.x = x;
+ cur_normal.y = y;
+ cur_normal.z = z;
+}
+
+
+void gl_color3f(float r, float g, float b)
+{
+ cur_color.x = r;
+ cur_color.y = g;
+ cur_color.z = b;
+ cur_color.w = 1.0f;
+}
+
+void gl_color4f(float r, float g, float b, float a)
+{
+ cur_color.x = r;
+ cur_color.y = g;
+ cur_color.z = b;
+ cur_color.w = a;
+}
+
+
+void gl_texcoord1f(float s)
+{
+ cur_texcoord.x = s;
+ cur_texcoord.y = 0.0f;
+}
+
+void gl_texcoord2f(float s, float t)
+{
+ cur_texcoord.x = s;
+ cur_texcoord.y = t;
+}
+
+void gl_vertex_attrib2f(int loc, float x, float y)
+{
+ aloc = loc;
+ cur_attrib.x = x;
+ cur_attrib.y = y;
+ cur_attrib.z = 0.0f;
+ cur_attrib.w = 1.0f;
+}
+
+void gl_vertex_attrib3f(int loc, float x, float y, float z)
+{
+ aloc = loc;
+ cur_attrib.x = x;
+ cur_attrib.y = y;
+ cur_attrib.z = z;
+ cur_attrib.w = 1.0f;
+}
+
+void gl_vertex_attrib4f(int loc, float x, float y, float z, float w)
+{
+ aloc = loc;
+ cur_attrib.x = x;
+ cur_attrib.y = y;
+ cur_attrib.z = z;
+ cur_attrib.w = w;
+}
--- /dev/null
+#ifndef SANEGL_H_
+#define SANEGL_H_
+
+#include "opengl.h"
+
+#ifndef GL_MODELVIEW
+#define GL_MODELVIEW 0x1700
+#endif
+#ifndef GL_PROJECTION
+#define GL_PROJECTION 0x1701
+#endif
+#ifndef GL_TEXTURE
+#define GL_TEXTURE 0x1702
+#endif
+
+#ifndef GL_POINTS
+#define GL_POINTS 0
+#endif
+#ifndef GL_LINES
+#define GL_LINES 1
+#endif
+#ifndef GL_TRIANGLES
+#define GL_TRIANGLES 4
+#endif
+#ifndef GL_QUADS
+#define GL_QUADS 7
+#endif
+
+#ifdef GLDEF
+
+#define glMatrixMode gl_matrix_mode
+#define glPushMatrix gl_push_matrix
+#define glPopMatrix gl_pop_matrix
+#define glLoadIdentity gl_load_identity
+#define glLoadMatrixf gl_load_matrixf
+#define glMultMatrixf gl_mult_matrixf
+#define glTranslatef gl_translatef
+#define glRotatef gl_rotatef
+#define glScalef gl_scalef
+#define glOrtho gl_ortho
+#define glFrustum gl_frustum
+#define gluPerspective glu_perspective
+
+#define glBegin gl_begin
+#define glEnd gl_end
+#define glVertex2f gl_vertex2f
+#define glVertex3f gl_vertex3f
+#define glVertex4f gl_vertex4f
+#define glNormal3f gl_normal3f
+#define glColor3f gl_color3f
+#define glColor4f gl_color4f
+#define glTexCoord1f gl_texcoord1f
+#define glTexCoord2f gl_texcoord2f
+#define glVertexAttrib2f gl_vertex_attrib2f
+#define glVertexAttrib3f gl_vertex_attrib3f
+#define glVertexAttrib4f gl_vertex_attrib4f
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* matrix stuff */
+void gl_matrix_mode(int mmode);
+void gl_push_matrix(void);
+void gl_pop_matrix(void);
+void gl_load_identity(void);
+void gl_load_matrixf(const float *mat);
+void gl_mult_matrixf(const float *mat);
+void gl_translatef(float x, float y, float z);
+void gl_rotatef(float angle, float x, float y, float z);
+void gl_scalef(float x, float y, float z);
+void gl_ortho(float left, float right, float bottom, float top, float near, float far);
+void gl_frustum(float left, float right, float bottom, float top, float near, float far);
+void glu_perspective(float vfov, float aspect, float near, float far);
+
+void gl_apply_xform(unsigned int prog);
+
+
+/* immediate mode rendering */
+void gl_begin(int prim);
+void gl_end(void);
+
+void gl_vertex2f(float x, float y);
+void gl_vertex3f(float x, float y, float z);
+void gl_vertex4f(float x, float y, float z, float w);
+
+void gl_normal3f(float x, float y, float z);
+
+void gl_color3f(float r, float g, float b);
+void gl_color4f(float r, float g, float b, float a);
+
+void gl_texcoord1f(float s);
+void gl_texcoord2f(float s, float t);
+
+void gl_vertex_attrib2f(int loc, float x, float y);
+void gl_vertex_attrib3f(int loc, float x, float y, float z);
+void gl_vertex_attrib4f(int loc, float x, float y, float z, float w);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SANEGL_H_ */
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