add initial glslUtil library
This commit is contained in:
Josh Holtrop
commit
060f3115bf
10
Makefile
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10
Makefile
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@ -0,0 +1,10 @@
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export SCONSFLAGS := -Q
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all:
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@scons
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install:
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@scons $@
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clean:
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@scons -c
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4
SConstruct
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4
SConstruct
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# vim:filetype=python
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env = Environment(CFLAGS = ['-Wall'], CPPFLAGS = ['-DGL_GLEXT_PROTOTYPES'])
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env.Object('glslUtil.o', 'glslUtil.c')
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349
glslUtil.c
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349
glslUtil.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <math.h>
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#include <string.h>
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#include "glslUtil.h"
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/**************************************************************************
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* Helper Functions *
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*************************************************************************/
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static char *loadFile(const char *fname)
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{
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struct stat st;
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if (stat(fname, &st) != 0)
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return NULL;
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if (st.st_size <= 0)
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return NULL;
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char * buff = malloc(st.st_size + 1);
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FILE *fil = fopen(fname, "r");
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fread(buff, st.st_size, 1, fil);
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fclose(fil);
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buff[st.st_size] = '\0';
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return buff;
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}
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void guMatrixLoadIdentity(guMatrix4x4 *m)
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{
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int i, j;
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for (i = 0; i < 4; i++)
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{
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for (j = 0; j < 4; j++)
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{
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(*m)[i][j] = (i == j) ? 1.0 : 0.0;
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}
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}
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}
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void guMatrixMult(guMatrix4x4 *m, guMatrix4x4 *a, guMatrix4x4 *b)
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{
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guMatrix4x4 tmp;
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int i, j, p;
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if (m == a)
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{
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memcpy(&tmp, a, sizeof(tmp));
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a = &tmp;
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}
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for (i = 0; i < 4; i++)
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{
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for (j = 0; j < 4; j++)
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{
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GLfloat v = 0.0;
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for (p = 0; p < 4; p++)
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{
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v += (*a)[p][i] * (*b)[j][p];
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}
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(*m)[j][i] = v;
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}
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}
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}
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void guMatrixTranslate(guMatrix4x4 *m, GLfloat x, GLfloat y, GLfloat z)
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{
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int i;
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for (i = 0; i < 4; i++)
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{
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(*m)[3][i] += (*m)[0][i] * x + (*m)[1][i] * y + (*m)[2][i] * z;
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}
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}
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void guMatrixScale(guMatrix4x4 *m, GLfloat x, GLfloat y, GLfloat z)
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{
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int i;
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for (i = 0; i < 4; i++)
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{
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(*m)[0][i] *= x;
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(*m)[1][i] *= y;
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(*m)[2][i] *= z;
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}
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}
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void guMatrixRotate(guMatrix4x4 *m, GLfloat angle,
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GLfloat x, GLfloat y, GLfloat z)
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{
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GLfloat lx = x, ly = y, lz = z, p;
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p = lx*lx + ly*ly + lz*lz;
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if (p != 1.0)
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{
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GLfloat scale = sqrt(p);
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lx /= scale;
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ly /= scale;
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lz /= scale;
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}
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GLfloat c = cos(M_PI * angle / 180.0);
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GLfloat s = sin(M_PI * angle / 180.0);
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guMatrix4x4 mult;
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GLfloat oc = 1 - c;
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mult[0][0] = lx * lx * oc + c;
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mult[1][0] = lx * ly * oc - lz * s;
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mult[2][0] = lx * lz * oc + ly * s;
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mult[3][0] = 0.0;
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mult[0][1] = ly * lx * oc + lz * s;
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mult[1][1] = ly * ly * oc + c;
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mult[2][1] = ly * lz * oc - lx * s;
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mult[3][1] = 0.0;
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mult[0][2] = lx * lz * oc - ly * s;
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mult[1][2] = ly * lz * oc + lx * s;
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mult[2][2] = lz * lz * oc + c;
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mult[3][2] = 0.0;
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mult[0][3] = 0.0;
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mult[1][3] = 0.0;
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mult[2][3] = 0.0;
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mult[3][3] = 1.0;
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guMatrixMult(m, m, &mult);
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}
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void guMatrixFrustum(guMatrix4x4 *m,
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GLfloat left, GLfloat right,
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GLfloat bottom, GLfloat top,
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GLfloat near, GLfloat far)
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{
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int i, j;
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guMatrix4x4 mult;
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for (i = 0; i < 4; i++)
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{
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for (j = 0; j < 4; j++)
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{
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mult[i][j] = 0.0;
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}
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}
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GLfloat rl = right - left;
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GLfloat tb = top - bottom;
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GLfloat fn = far - near;
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mult[0][0] = 2 * near / rl;
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mult[2][0] = (right + left) / rl;
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mult[1][1] = 2 * near / tb;
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mult[2][1] = (top + bottom) / tb;
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mult[2][2] = - (far + near) / fn;
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mult[3][2] = - 2 * far * near / fn;
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mult[2][3] = -1.0;
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guMatrixMult(m, m, &mult);
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}
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void guMatrixPerspective(guMatrix4x4 *m, GLfloat fovy, GLfloat aspect,
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GLfloat near, GLfloat far)
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{
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int i, j;
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guMatrix4x4 mult;
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for (i = 0; i < 4; i++)
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{
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for (j = 0; j < 4; j++)
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{
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mult[i][j] = 0.0;
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}
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}
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GLfloat f = 1.0 / tan(M_PI * fovy / 360.0);
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GLfloat nf = near - far;
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mult[0][0] = f / aspect;
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mult[1][1] = f;
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mult[2][2] = (far + near) / nf;
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mult[3][2] = (2 * far * near) / nf;
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mult[2][3] = -1.0;
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guMatrixMult(m, m, &mult);
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}
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void guMatrixOrtho(guMatrix4x4 *m,
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GLfloat left, GLfloat right,
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GLfloat bottom, GLfloat top,
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GLfloat near, GLfloat far)
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{
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int i, j;
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guMatrix4x4 mult;
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for (i = 0; i < 4; i++)
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{
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for (j = 0; j < 4; j++)
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{
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mult[i][j] = 0.0;
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}
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}
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GLfloat rl = right - left;
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GLfloat tb = top - bottom;
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GLfloat fn = far - near;
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mult[0][0] = 2 / rl;
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mult[3][0] = - (right + left) / rl;
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mult[1][1] = 2 / tb;
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mult[3][1] = - (top + bottom) / tb;
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mult[2][2] = -2 / fn;
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mult[3][2] = - (far + near) / fn;
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mult[3][3] = 1.0;
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guMatrixMult(m, m, &mult);
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}
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void guMatrix4x4To3x3(guMatrix3x3 *out, const guMatrix4x4 *in)
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{
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int i;
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for (i = 0; i < 3; i++)
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{
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memcpy(&(*out)[i], &(*in)[i], sizeof((*out)[0][0] * 3));
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}
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}
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char *guGetShaderLog(GLuint id)
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{
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GLint log_length;
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glGetShaderiv(id, GL_INFO_LOG_LENGTH, &log_length);
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if (log_length > 0)
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{
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char *log = malloc(sizeof(char) * log_length);
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glGetShaderInfoLog(id, log_length, &log_length, log);
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return log;
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}
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return NULL;
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}
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char *guGetProgramLog(GLuint id)
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{
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GLint log_length;
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glGetProgramiv(id, GL_INFO_LOG_LENGTH, &log_length);
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if (log_length > 0)
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{
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char *log = malloc(sizeof(char) * log_length);
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glGetProgramInfoLog(id, log_length, &log_length, log);
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return log;
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}
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return NULL;
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}
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GLuint guMakeShaderFromFile(GLenum shaderType, const char *fname)
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{
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char *source;
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source = loadFile(fname);
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if (source == NULL)
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{
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fprintf(stderr, "Error reading file '%s'\n", fname);
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return 0;
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}
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GLuint id = guMakeShader(shaderType, source);
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free(source);
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return id;
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}
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GLuint guMakeShader(GLenum shaderType, const char *source)
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{
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GLuint id;
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GLint status;
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id = glCreateShader(shaderType);
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if (id <= 0)
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{
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fprintf(stderr, "Error creating shader object\n");
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goto out;
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}
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glShaderSource(id, 1, &source, NULL);
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glCompileShader(id);
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glGetShaderiv(id, GL_COMPILE_STATUS, &status);
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if (status != GL_TRUE)
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{
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fprintf(stderr, "Error compiling shader\n");
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char *log = guGetShaderLog(id);
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fprintf(stderr, "Shader Log:\n%s\n", log);
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free(log);
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goto cleanup_shader;
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}
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return id;
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cleanup_shader:
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glDeleteShader(id);
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out:
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return 0;
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}
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GLuint guMakeBuffer(GLenum target, GLenum usage, const void *ptr, size_t sz)
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{
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GLuint id;
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glGenBuffers(1, &id);
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glBindBuffer(target, id);
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glBufferData(target, sz, ptr, usage);
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return id;
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}
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GLuint guMakeProgramFromSource(const char *v_shader, const char *f_shader,
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const guAttribBinding *bindings)
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{
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GLuint v_shader_id = guMakeShader(GL_VERTEX_SHADER, v_shader);
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GLuint f_shader_id = guMakeShader(GL_FRAGMENT_SHADER, f_shader);
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if (v_shader_id <= 0 || f_shader_id <= 0)
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return 0;
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GLuint id = guMakeProgram(v_shader_id, f_shader_id, bindings);
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glDeleteShader(v_shader_id);
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glDeleteShader(f_shader_id);
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return id;
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}
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GLuint guMakeProgramFromFiles(const char *v_shader, const char *f_shader,
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const guAttribBinding *bindings)
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{
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GLuint v_shader_id = guMakeShaderFromFile(GL_VERTEX_SHADER, v_shader);
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GLuint f_shader_id = guMakeShaderFromFile(GL_FRAGMENT_SHADER, f_shader);
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if (v_shader_id <= 0 || f_shader_id <= 0)
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return 0;
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GLuint id = guMakeProgram(v_shader_id, f_shader_id, bindings);
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glDeleteShader(v_shader_id);
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glDeleteShader(f_shader_id);
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return id;
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}
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GLuint guMakeProgram(GLuint v_shader_id, GLuint f_shader_id,
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const guAttribBinding *bindings)
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{
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GLuint program = glCreateProgram();
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glAttachShader(program, v_shader_id);
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glAttachShader(program, f_shader_id);
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if (bindings != NULL)
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{
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int i;
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for (i = 0; bindings[i].name != NULL; i++)
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{
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glBindAttribLocation(program, bindings[i].index, bindings[i].name);
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}
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}
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glLinkProgram(program);
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GLint link_status;
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glGetProgramiv(program, GL_LINK_STATUS, &link_status);
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if (link_status != GL_TRUE)
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{
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char *log = guGetProgramLog(program);
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fprintf(stderr, "Program log:\n%s\n", log);
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free(log);
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return 0;
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}
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return program;
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}
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void guGetUniformLocations(GLuint program, guUniformLocation *locs)
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{
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int i;
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for (i = 0; locs[i].name != NULL; i++)
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{
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*locs[i].loc = glGetUniformLocation(program, locs[i].name);
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}
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}
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65
glslUtil.h
Normal file
65
glslUtil.h
Normal file
@ -0,0 +1,65 @@
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#ifndef GLSLUTIL_H
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#define GLSLUTIL_H
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#ifdef GL_INCLUDE_FILE
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#include GL_INCLUDE_FILE
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#else
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#include <GL/gl.h>
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#endif
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typedef GLfloat guMatrix3x3[3][3];
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typedef GLfloat guMatrix4x4[4][4];
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typedef struct {
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GLuint index;
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const char *name;
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} guAttribBinding;
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typedef struct {
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GLint *loc;
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const char *name;
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} guUniformLocation;
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#ifdef __cplusplus
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extern "C" {
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#endif
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void guMatrixLoadIdentity(guMatrix4x4 *m);
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void guMatrixMult(guMatrix4x4 *m, guMatrix4x4 *a, guMatrix4x4 *b);
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void guMatrixTranslate(guMatrix4x4 *m, GLfloat x, GLfloat y, GLfloat z);
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void guMatrixScale(guMatrix4x4 *m, GLfloat x, GLfloat y, GLfloat z);
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void guMatrixRotate(guMatrix4x4 *m, GLfloat angle,
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GLfloat x, GLfloat y, GLfloat z);
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void guMatrixFrustum(guMatrix4x4 *m,
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GLfloat left, GLfloat right,
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GLfloat bottom, GLfloat top,
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GLfloat near, GLfloat far);
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void guMatrixPerspective(guMatrix4x4 *m, GLfloat fovy, GLfloat aspect,
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GLfloat near, GLfloat far);
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void guMatrixOrtho(guMatrix4x4 *m,
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GLfloat left, GLfloat right,
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GLfloat bottom, GLfloat top,
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GLfloat near, GLfloat far);
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void guMatrix4x4To3x3(guMatrix3x3 *out, const guMatrix4x4 *in);
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char *guGetShaderLog(GLuint id);
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char *guGetProgramLog(GLuint id);
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GLuint guMakeShaderFromFile(GLenum shaderType, const char *fname);
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GLuint guMakeShader(GLenum shaderType, const char *source);
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GLuint guMakeProgramFromSource(const char *v_shader, const char *f_shader,
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const guAttribBinding *bindings);
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GLuint guMakeProgramFromFiles(const char *v_shader, const char *f_shader,
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const guAttribBinding *bindings);
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GLuint guMakeProgram(GLuint v_shader_id, GLuint f_shader_id,
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const guAttribBinding *bindings);
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void guGetUniformLocations(GLuint program, guUniformLocation *locs);
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GLuint guMakeBuffer(GLenum target, GLenum usage, const void *ptr, size_t sz);
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#ifdef __cplusplus
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}
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#endif
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#endif
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