14 #define BUFFER_OFFSET(i) ((char *)NULL + (i))
16 // Converts a HSV color to RGB. Assumes h in [0, 2pi> or [-pi, pi>
17 void hsv2rgb(float h, float s, float v, float *r, float *g, float *b);
19 // Converts a HSV color to RGB, but keeps luminance constant
20 // (ie. color luminance is as if S=0).
21 void hsv2rgb_normalized(float h, float s, float v, float *r, float *g, float *b);
23 // Read a file from disk and return its contents.
24 // Dies if the file does not exist.
25 std::string read_file(const std::string &filename);
27 // Compile the given GLSL shader (typically a vertex or fragment shader)
28 // and return the object number.
29 GLuint compile_shader(const std::string &shader_src, GLenum type);
31 // Print a 3x3 matrix to standard output. Useful for debugging.
32 void print_3x3_matrix(const Eigen::Matrix3d &m);
34 // Output a GLSL 3x3 matrix declaration.
35 std::string output_glsl_mat3(const std::string &name, const Eigen::Matrix3d &m);
37 // Calculate where to sample, and with what weight, if one wants to use
38 // the GPU's bilinear hardware to sample w1 * x[0] + w2 * x[1].
40 // Note that since the GPU might have limited precision in its linear
41 // interpolation, the effective weights might be different from the ones you
42 // asked for. sum_sq_error, if not NULL, will contain the sum of the
43 // (estimated) squared errors of the two weights.
44 void combine_two_samples(float w1, float w2, float *offset, float *total_weight, float *sum_sq_error);
49 #define check_error() { int err = glGetError(); if (err != GL_NO_ERROR) { printf("GL error 0x%x at %s:%d\n", err, __FILE__, __LINE__); exit(1); } }
53 #define MUST_CHECK_RESULT __attribute__((warn_unused_result))
55 #define MUST_CHECK_RESULT
58 // CHECK() is like assert(), but retains any side effects no matter the compilation mode.
60 #define CHECK(x) (void)(x)
62 #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)
65 #endif // !defined(_UTIL_H)