X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=util.cpp;h=2176786978544994fcb733a4a2bea5f6fb9f77f5;hp=592e4d56b47f842a6bb6493e634992bb9cfe0ec5;hb=758f632c42befae7f2b7af137554429fa544d4cb;hpb=02d19b8323a1b626acd9d3b4f08bb63f51149cf3

diff --git a/util.cpp b/util.cpp
index 592e4d5..2176786 100644
--- a/util.cpp
+++ b/util.cpp
@@ -1,5 +1,12 @@
-#include <math.h>
+#define GL_GLEXT_PROTOTYPES 1
+
+#include <stdio.h>
+#include <assert.h>
 
+#include <GL/gl.h>
+#include <GL/glext.h>
+
+#include <math.h>
 #include "util.h"
 
 void hsv2rgb(float h, float s, float v, float *r, float *g, float *b)
@@ -42,3 +49,84 @@ void hsv2rgb(float h, float s, float v, float *r, float *g, float *b)
 	*g += m;
 	*b += m;
 }
+
+std::string read_file(const std::string &filename)
+{
+	static char buf[131072];
+	FILE *fp = fopen(filename.c_str(), "r");
+	if (fp == NULL) {
+		perror(filename.c_str());
+		exit(1);
+	}
+
+	int len = fread(buf, 1, sizeof(buf), fp);
+	fclose(fp);
+
+	return std::string(buf, len);
+}
+
+GLhandleARB compile_shader(const std::string &shader_src, GLenum type)
+{
+	GLhandleARB obj = glCreateShaderObjectARB(type);
+	const GLchar* source[] = { shader_src.data() };
+	const GLint length[] = { shader_src.size() };
+	glShaderSource(obj, 1, source, length);
+	glCompileShader(obj);
+
+	GLchar info_log[4096];
+	GLsizei log_length = sizeof(info_log) - 1;
+	glGetShaderInfoLog(obj, log_length, &log_length, info_log);
+	info_log[log_length] = 0; 
+	printf("shader compile log: %s\n", info_log);
+
+	GLint status;
+	glGetShaderiv(obj, GL_COMPILE_STATUS, &status);
+	if (status == GL_FALSE) {
+		exit(1);
+	}
+
+	return obj;
+}
+
+void multiply_3x3_matrices(const Matrix3x3 a, const Matrix3x3 b, Matrix3x3 result)
+{
+        result[0] = a[0] * b[0] + a[3] * b[1] + a[6] * b[2];
+        result[1] = a[1] * b[0] + a[4] * b[1] + a[7] * b[2];
+        result[2] = a[2] * b[0] + a[5] * b[1] + a[8] * b[2];
+
+        result[3] = a[0] * b[3] + a[3] * b[4] + a[6] * b[5];
+        result[4] = a[1] * b[3] + a[4] * b[4] + a[7] * b[5];
+        result[5] = a[2] * b[3] + a[5] * b[4] + a[8] * b[5];
+
+        result[6] = a[0] * b[6] + a[3] * b[7] + a[6] * b[8];
+        result[7] = a[1] * b[6] + a[4] * b[7] + a[7] * b[8];
+        result[8] = a[2] * b[6] + a[5] * b[7] + a[8] * b[8];
+}
+
+void invert_3x3_matrix(const Matrix3x3 m, Matrix3x3 result)
+{
+	double inv_det = 1.0 / (
+		m[6] * m[1] * m[5] - m[6] * m[2] * m[4] -
+		m[3] * m[1] * m[8] + m[3] * m[2] * m[7] +
+		m[0] * m[4] * m[8] - m[0] * m[5] * m[7]);
+
+	result[0] = inv_det * (m[4] * m[8] - m[5] * m[7]);
+	result[1] = inv_det * (m[2] * m[7] - m[1] * m[8]);
+	result[2] = inv_det * (m[1] * m[5] - m[2] * m[4]);
+
+	result[3] = inv_det * (m[6] * m[5] - m[3] * m[8]);
+	result[4] = inv_det * (m[0] * m[8] - m[6] * m[2]);
+	result[5] = inv_det * (m[3] * m[2] - m[0] * m[5]);
+
+	result[6] = inv_det * (m[3] * m[7] - m[6] * m[4]);
+	result[7] = inv_det * (m[6] * m[1] - m[0] * m[7]);
+	result[8] = inv_det * (m[0] * m[4] - m[3] * m[1]);
+}
+
+void print_3x3_matrix(const Matrix3x3 m)
+{
+	printf("%6.4f %6.4f %6.4f\n", m[0], m[3], m[6]);
+	printf("%6.4f %6.4f %6.4f\n", m[1], m[4], m[7]);
+	printf("%6.4f %6.4f %6.4f\n", m[2], m[5], m[8]);
+	printf("\n");
+}