X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=util.h;h=f62618c404325ef7ef44f2b5b02326e208fc32c7;hp=3957b863c1ec8a635ab720f88a263320d0c54919;hb=ca4d87878bb32c7d672ac00f41ca0292f19acfcb;hpb=928743085b7f0f88b3e1b0e59e2d7ebec7816bd2

diff --git a/util.h b/util.h
index 3957b86..f62618c 100644
--- a/util.h
+++ b/util.h
@@ -1,20 +1,61 @@
-#ifndef _UTIL_H
-#define _UTIL_H 1
+#ifndef _MOVIT_UTIL_H
+#define _MOVIT_UTIL_H 1
 
+// Various utilities.
+
+#include <GL/glew.h>
 #include <stdio.h>
 #include <stdlib.h>
-
+#include <Eigen/Core>
 #include <string>
 
-// assumes h in [0, 2pi> or [-pi, pi>
+#define BUFFER_OFFSET(i) ((char *)NULL + (i))
+
+namespace movit {
+
+// Converts a HSV color to RGB. Assumes h in [0, 2pi> or [-pi, pi>
 void hsv2rgb(float h, float s, float v, float *r, float *g, float *b);
 
+// Converts a HSV color to RGB, but keeps luminance constant
+// (ie. color luminance is as if S=0).
+void hsv2rgb_normalized(float h, float s, float v, float *r, float *g, float *b);
+
+// Read a file from disk and return its contents.
+// Dies if the file does not exist.
 std::string read_file(const std::string &filename);
 
+// Compile the given GLSL shader (typically a vertex or fragment shader)
+// and return the object number.
+GLuint compile_shader(const std::string &shader_src, GLenum type);
+
+// Print a 3x3 matrix to standard output. Useful for debugging.
+void print_3x3_matrix(const Eigen::Matrix3d &m);
+
+// Output a GLSL 3x3 matrix declaration.
+std::string output_glsl_mat3(const std::string &name, const Eigen::Matrix3d &m);
+
+// Calculate where to sample, and with what weight, if one wants to use
+// the GPU's bilinear hardware to sample w1 * x[0] + w2 * x[1].
+//
+// Note that since the GPU might have limited precision in its linear
+// interpolation, the effective weights might be different from the ones you
+// asked for. sum_sq_error, if not NULL, will contain the sum of the
+// (estimated) squared errors of the two weights.
+void combine_two_samples(float w1, float w2, float *offset, float *total_weight, float *sum_sq_error);
+
+}  // namespace movit
+
 #ifdef NDEBUG
 #define check_error()
 #else
-#define check_error() { int err = glGetError(); if (err != GL_NO_ERROR) { printf("GL error 0x%x at line %d\n", err, __LINE__); exit(1); } }
+#define check_error() { int err = glGetError(); if (err != GL_NO_ERROR) { printf("GL error 0x%x at %s:%d\n", err, __FILE__, __LINE__); abort(); } }
+#endif
+
+// CHECK() is like assert(), but retains any side effects no matter the compilation mode.
+#ifdef NDEBUG
+#define CHECK(x) (void)(x)
+#else
+#define CHECK(x) do { bool ok = x; if (!ok) { fprintf(stderr, "%s:%d: %s: Assertion `%s' failed.\n", __FILE__, __LINE__, __PRETTY_FUNCTION__, #x); abort(); } } while (false)
 #endif
 
-#endif // !defined(_UTIL_H)
+#endif // !defined(_MOVIT_UTIL_H)