#include <stdio.h>
+#include <math.h>
+#include <string.h>
#include <assert.h>
+#include <GL/glew.h>
-#include <math.h>
#include "util.h"
-#include "opengl.h"
+#include "init.h"
+
+extern std::string *movit_data_directory;
void hsv2rgb(float h, float s, float v, float *r, float *g, float *b)
{
std::string read_file(const std::string &filename)
{
+ const std::string full_pathname = *movit_data_directory + "/" + filename;
+
static char buf[131072];
- FILE *fp = fopen(filename.c_str(), "r");
+ FILE *fp = fopen(full_pathname.c_str(), "r");
if (fp == NULL) {
- perror(filename.c_str());
+ perror(full_pathname.c_str());
exit(1);
}
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);
+ if (strlen(info_log) > 0) {
+ printf("shader compile log: %s\n", info_log);
+ }
GLint status;
glGetShaderiv(obj, GL_COMPILE_STATUS, &status);
return obj;
}
-void multiply_3x3_matrices(const Matrix3x3 a, const Matrix3x3 b, Matrix3x3 result)
+void print_3x3_matrix(const Eigen::Matrix3d& m)
{
- 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];
+ printf("%6.4f %6.4f %6.4f\n", m(0,0), m(0,1), m(0,2));
+ printf("%6.4f %6.4f %6.4f\n", m(1,0), m(1,1), m(1,2));
+ printf("%6.4f %6.4f %6.4f\n", m(2,0), m(2,1), m(2,2));
+ printf("\n");
}
-void multiply_3x3_matrix_float3(const Matrix3x3 M, float x0, float x1, float x2, float *y0, float *y1, float *y2)
+std::string output_glsl_mat3(const std::string &name, const Eigen::Matrix3d &m)
{
- *y0 = M[0] * x0 + M[3] * x1 + M[6] * x2;
- *y1 = M[1] * x0 + M[4] * x1 + M[7] * x2;
- *y2 = M[2] * x0 + M[5] * x1 + M[8] * x2;
+ char buf[1024];
+ sprintf(buf,
+ "const mat3 %s = mat3(\n"
+ " %.8f, %.8f, %.8f,\n"
+ " %.8f, %.8f, %.8f,\n"
+ " %.8f, %.8f, %.8f);\n\n",
+ name.c_str(),
+ m(0,0), m(1,0), m(2,0),
+ m(0,1), m(1,1), m(2,1),
+ m(0,2), m(1,2), m(2,2));
+ return buf;
}
-void invert_3x3_matrix(const Matrix3x3 m, Matrix3x3 result)
+void combine_two_samples(float w1, float w2, float *offset, float *total_weight, float *sum_sq_error)
{
- 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]);
-}
+ assert(movit_initialized);
+ assert(w1 * w2 >= 0.0f); // Should not have differing signs.
+ float z; // Just a shorter name for offset.
+ if (fabs(w1 + w2) < 1e-6) {
+ z = 0.5f;
+ } else {
+ z = w2 / (w1 + w2);
+ }
-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");
+ // Round to the minimum number of bits we have measured earlier.
+ // The card will do this for us anyway, but if we know what the real z
+ // is, we can pick a better total_weight below.
+ z = lrintf(z / movit_texel_subpixel_precision) * movit_texel_subpixel_precision;
+
+ // Choose total weight w so that we minimize total squared error
+ // for the effective weights:
+ //
+ // e = (w(1-z) - a)² + (wz - b)²
+ //
+ // Differentiating by w and setting equal to zero:
+ //
+ // 2(w(1-z) - a)(1-z) + 2(wz - b)z = 0
+ // w(1-z)² - a(1-z) + wz² - bz = 0
+ // w((1-z)² + z²) = a(1-z) + bz
+ // w = (a(1-z) + bz) / ((1-z)² + z²)
+ //
+ // If z had infinite precision, this would simply reduce to w = w1 + w2.
+ *total_weight = (w1 * (1 - z) + w2 * z) / (z * z + (1 - z) * (1 - z));
+ *offset = z;
+
+ if (sum_sq_error != NULL) {
+ float err1 = *total_weight * (1 - z) - w1;
+ float err2 = *total_weight * z - w2;
+ *sum_sq_error = err1 * err1 + err2 * err2;
+ }
+
+ assert(*offset >= 0.0f);
+ assert(*offset <= 1.0f);
}
projects / movit / blobdiff