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                        YCbCrInputSplitting ycbcr_input_splitting)
  23         : image_format(image_format),
  24           ycbcr_format(ycbcr_format),
  25           ycbcr_input_splitting(ycbcr_input_splitting),
  26           width(width),
  27           height(height),
  28           resource_pool(NULL)
  29 {
  30         pbos[0] = pbos[1] = pbos[2] = 0;
  31         texture_num[0] = texture_num[1] = texture_num[2] = 0;
  32
  33         set_width(width);
  34         set_height(height);
  35
  36         pixel_data[0] = pixel_data[1] = pixel_data[2] = NULL;
  37         owns_texture[0] = owns_texture[1] = owns_texture[2] = false;
  38
  39         register_uniform_sampler2d("tex_y", &uniform_tex_y);
  40
  41         if (ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
  42                 num_channels = 2;
  43                 register_uniform_sampler2d("tex_cbcr", &uniform_tex_cb);
  44         } else {
  45                 assert(ycbcr_input_splitting == YCBCR_INPUT_PLANAR);
  46                 num_channels = 3;
  47                 register_uniform_sampler2d("tex_cb", &uniform_tex_cb);
  48                 register_uniform_sampler2d("tex_cr", &uniform_tex_cr);
  49         }
  50 }
  51
  52 YCbCrInput::~YCbCrInput()
  53 {
  54         for (unsigned channel = 0; channel < num_channels; ++channel) {
  55                 possibly_release_texture(channel);
  56         }
  57 }
  58
  59 void YCbCrInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  60 {
  61         for (unsigned channel = 0; channel < num_channels; ++channel) {
  62                 glActiveTexture(GL_TEXTURE0 + *sampler_num + channel);
  63                 check_error();
  64
  65                 if (texture_num[channel] == 0) {
  66                         GLenum format, internal_format;
  67                         if (channel == 1 && ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
  68                                 format = GL_RG;
  69                                 internal_format = GL_RG8;
  70                         } else {
  71                                 format = GL_RED;
  72                                 internal_format = GL_R8;
  73                         }
  74
  75                         // (Re-)upload the texture.
  76                         texture_num[channel] = resource_pool->create_2d_texture(internal_format, widths[channel], heights[channel]);
  77                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
  78                         check_error();
  79                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  80                         check_error();
  81                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbos[channel]);
  82                         check_error();
  83                         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  84                         check_error();
  85                         glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch[channel]);
  86                         check_error();
  87                         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, widths[channel], heights[channel], format, GL_UNSIGNED_BYTE, pixel_data[channel]);
  88                         check_error();
  89                         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  90                         check_error();
  91                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  92                         check_error();
  93                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  94                         check_error();
  95                         owns_texture[channel] = true;
  96                 } else {
  97                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
  98                         check_error();
  99                 }
 100         }
 101
 102         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 103         check_error();
 104
 105         // Bind samplers.
 106         uniform_tex_y = *sampler_num + 0;
 107         uniform_tex_cb = *sampler_num + 1;
 108         if (ycbcr_input_splitting == YCBCR_INPUT_PLANAR) {
 109                 uniform_tex_cr = *sampler_num + 2;
 110         }
 111
 112         *sampler_num += num_channels;
 113 }
 114
 115 string YCbCrInput::output_fragment_shader()
 116 {
 117         float offset[3];
 118         Matrix3d ycbcr_to_rgb;
 119         compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
 120
 121         string frag_shader;
 122
 123         frag_shader = output_glsl_mat3("PREFIX(inv_ycbcr_matrix)", ycbcr_to_rgb);
 124         frag_shader += output_glsl_vec3("PREFIX(offset)", offset[0], offset[1], offset[2]);
 125
 126         float cb_offset_x = compute_chroma_offset(
 127                 ycbcr_format.cb_x_position, ycbcr_format.chroma_subsampling_x, widths[1]);
 128         float cb_offset_y = compute_chroma_offset(
 129                 ycbcr_format.cb_y_position, ycbcr_format.chroma_subsampling_y, heights[1]);
 130         frag_shader += output_glsl_vec2("PREFIX(cb_offset)", cb_offset_x, cb_offset_y);
 131
 132         float cr_offset_x = compute_chroma_offset(
 133                 ycbcr_format.cr_x_position, ycbcr_format.chroma_subsampling_x, widths[2]);
 134         float cr_offset_y = compute_chroma_offset(
 135                 ycbcr_format.cr_y_position, ycbcr_format.chroma_subsampling_y, heights[2]);
 136         frag_shader += output_glsl_vec2("PREFIX(cr_offset)", cr_offset_x, cr_offset_y);
 137
 138         if (ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
 139                 char buf[256];
 140                 snprintf(buf, sizeof(buf), "#define CB_CR_SAME_TEXTURE 1\n#define CB_CR_OFFSETS_EQUAL %d\n",
 141                         (fabs(ycbcr_format.cb_x_position - ycbcr_format.cr_x_position) < 1e-6));
 142                 frag_shader += buf;
 143         } else {
 144                 frag_shader += "#define CB_CR_SAME_TEXTURE 0\n";
 145         }
 146
 147         frag_shader += read_file("ycbcr_input.frag");
 148         return frag_shader;
 149 }
 150
 151 void YCbCrInput::invalidate_pixel_data()
 152 {
 153         for (unsigned channel = 0; channel < 3; ++channel) {
 154                 possibly_release_texture(channel);
 155         }
 156 }
 157
 158 bool YCbCrInput::set_int(const std::string& key, int value)
 159 {
 160         if (key == "needs_mipmaps") {
 161                 // We currently do not support this.
 162                 return (value == 0);
 163         }
 164         return Effect::set_int(key, value);
 165 }
 166
 167 void YCbCrInput::possibly_release_texture(unsigned channel)
 168 {
 169         if (texture_num[channel] != 0 && owns_texture[channel]) {
 170                 resource_pool->release_2d_texture(texture_num[channel]);
 171                 texture_num[channel] = 0;
 172                 owns_texture[channel] = false;
 173         }
 174 }
 175
 176 }  // namespace movit