git.sesse.net Git - movit/blob - ycbcr_input.cpp

   1 #include <Eigen/Core>
   2 #include <Eigen/LU>
   3 #include <epoxy/gl.h>
   4 #include <assert.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 #include "effect_util.h"
   9 #include "resource_pool.h"
  10 #include "util.h"
  11 #include "ycbcr.h"
  12 #include "ycbcr_input.h"
  13
  14 using namespace Eigen;
  15 using namespace std;
  16
  17 namespace movit {
  18
  19 YCbCrInput::YCbCrInput(const ImageFormat &image_format,
  20                        const YCbCrFormat &ycbcr_format,
  21                        unsigned width, unsigned height)
  22         : image_format(image_format),
  23           ycbcr_format(ycbcr_format),
  24           width(width),
  25           height(height),
  26           resource_pool(NULL)
  27 {
  28         pbos[0] = pbos[1] = pbos[2] = 0;
  29         texture_num[0] = texture_num[1] = texture_num[2] = 0;
  30
  31         assert(width % ycbcr_format.chroma_subsampling_x == 0);
  32         pitch[0] = widths[0] = width;
  33         pitch[1] = widths[1] = width / ycbcr_format.chroma_subsampling_x;
  34         pitch[2] = widths[2] = width / ycbcr_format.chroma_subsampling_x;
  35
  36         assert(height % ycbcr_format.chroma_subsampling_y == 0);
  37         heights[0] = height;
  38         heights[1] = height / ycbcr_format.chroma_subsampling_y;
  39         heights[2] = height / ycbcr_format.chroma_subsampling_y;
  40
  41         pixel_data[0] = pixel_data[1] = pixel_data[2] = NULL;
  42 }
  43
  44 YCbCrInput::~YCbCrInput()
  45 {
  46         for (unsigned channel = 0; channel < 3; ++channel) {
  47                 if (texture_num[channel] != 0) {
  48                         resource_pool->release_2d_texture(texture_num[channel]);
  49                 }
  50         }
  51 }
  52
  53 void YCbCrInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  54 {
  55         for (unsigned channel = 0; channel < 3; ++channel) {
  56                 glActiveTexture(GL_TEXTURE0 + *sampler_num + channel);
  57                 check_error();
  58
  59                 if (texture_num[channel] == 0) {
  60                         // (Re-)upload the texture.
  61                         texture_num[channel] = resource_pool->create_2d_texture(GL_R8, widths[channel], heights[channel]);
  62                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
  63                         check_error();
  64                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  65                         check_error();
  66                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbos[channel]);
  67                         check_error();
  68                         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  69                         check_error();
  70                         glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch[channel]);
  71                         check_error();
  72                         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, widths[channel], heights[channel], GL_RED, GL_UNSIGNED_BYTE, pixel_data[channel]);
  73                         check_error();
  74                         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  75                         check_error();
  76                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  77                         check_error();
  78                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  79                         check_error();
  80                 } else {
  81                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
  82                         check_error();
  83                 }
  84         }
  85
  86         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
  87         check_error();
  88
  89         // Bind samplers.
  90         set_uniform_int(glsl_program_num, prefix, "tex_y", *sampler_num + 0);
  91         set_uniform_int(glsl_program_num, prefix, "tex_cb", *sampler_num + 1);
  92         set_uniform_int(glsl_program_num, prefix, "tex_cr", *sampler_num + 2);
  93
  94         *sampler_num += 3;
  95 }
  96
  97 string YCbCrInput::output_fragment_shader()
  98 {
  99         float offset[3];
 100         Matrix3d ycbcr_to_rgb;
 101         compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
 102
 103         string frag_shader;
 104
 105         frag_shader = output_glsl_mat3("PREFIX(inv_ycbcr_matrix)", ycbcr_to_rgb);
 106         frag_shader += output_glsl_vec3("PREFIX(offset)", offset[0], offset[1], offset[2]);
 107
 108         float cb_offset_x = compute_chroma_offset(
 109                 ycbcr_format.cb_x_position, ycbcr_format.chroma_subsampling_x, widths[1]);
 110         float cb_offset_y = compute_chroma_offset(
 111                 ycbcr_format.cb_y_position, ycbcr_format.chroma_subsampling_y, heights[1]);
 112         frag_shader += output_glsl_vec2("PREFIX(cb_offset)", cb_offset_x, cb_offset_y);
 113
 114         float cr_offset_x = compute_chroma_offset(
 115                 ycbcr_format.cr_x_position, ycbcr_format.chroma_subsampling_x, widths[2]);
 116         float cr_offset_y = compute_chroma_offset(
 117                 ycbcr_format.cr_y_position, ycbcr_format.chroma_subsampling_y, heights[2]);
 118         frag_shader += output_glsl_vec2("PREFIX(cr_offset)", cr_offset_x, cr_offset_y);
 119
 120         frag_shader += read_file("ycbcr_input.frag");
 121         return frag_shader;
 122 }
 123
 124 void YCbCrInput::invalidate_pixel_data()
 125 {
 126         for (unsigned channel = 0; channel < 3; ++channel) {
 127                 if (texture_num[channel] != 0) {
 128                         resource_pool->release_2d_texture(texture_num[channel]);
 129                         texture_num[channel] = 0;
 130                 }
 131         }
 132 }
 133
 134 bool YCbCrInput::set_int(const std::string& key, int value)
 135 {
 136         if (key == "needs_mipmaps") {
 137                 // We currently do not support this.
 138                 return (value == 0);
 139         }
 140         return Effect::set_int(key, value);
 141 }
 142
 143 }  // namespace movit