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                        GLenum type)
  24         : image_format(image_format),
  25           ycbcr_format(ycbcr_format),
  26           ycbcr_input_splitting(ycbcr_input_splitting),
  27           needs_mipmaps(false),
  28           type(type),
  29           width(width),
  30           height(height),
  31           resource_pool(NULL)
  32 {
  33         pbos[0] = pbos[1] = pbos[2] = 0;
  34         texture_num[0] = texture_num[1] = texture_num[2] = 0;
  35
  36         set_width(width);
  37         set_height(height);
  38
  39         pixel_data[0] = pixel_data[1] = pixel_data[2] = NULL;
  40         owns_texture[0] = owns_texture[1] = owns_texture[2] = false;
  41
  42         register_uniform_sampler2d("tex_y", &uniform_tex_y);
  43
  44         if (ycbcr_input_splitting == YCBCR_INPUT_INTERLEAVED) {
  45                 num_channels = 1;
  46                 assert(ycbcr_format.chroma_subsampling_x == 1);
  47                 assert(ycbcr_format.chroma_subsampling_y == 1);
  48         } else if (ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
  49                 num_channels = 2;
  50                 register_uniform_sampler2d("tex_cbcr", &uniform_tex_cb);
  51         } else {
  52                 assert(ycbcr_input_splitting == YCBCR_INPUT_PLANAR);
  53                 num_channels = 3;
  54                 register_uniform_sampler2d("tex_cb", &uniform_tex_cb);
  55                 register_uniform_sampler2d("tex_cr", &uniform_tex_cr);
  56         }
  57
  58         register_int("needs_mipmaps", &needs_mipmaps);
  59 }
  60
  61 YCbCrInput::~YCbCrInput()
  62 {
  63         for (unsigned channel = 0; channel < num_channels; ++channel) {
  64                 possibly_release_texture(channel);
  65         }
  66 }
  67
  68 void YCbCrInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  69 {
  70         for (unsigned channel = 0; channel < num_channels; ++channel) {
  71                 glActiveTexture(GL_TEXTURE0 + *sampler_num + channel);
  72                 check_error();
  73
  74                 if (texture_num[channel] == 0 && (pbos[channel] != 0 || pixel_data[channel] != NULL)) {
  75                         GLenum format, internal_format;
  76                         if (channel == 0 && ycbcr_input_splitting == YCBCR_INPUT_INTERLEAVED) {
  77                                 if (type == GL_UNSIGNED_INT_2_10_10_10_REV) {
  78                                         format = GL_RGBA;
  79                                         internal_format = GL_RGB10_A2;
  80                                 } else if (type == GL_UNSIGNED_SHORT) {
  81                                         format = GL_RGB;
  82                                         internal_format = GL_RGB16;
  83                                 } else {
  84                                         assert(type == GL_UNSIGNED_BYTE);
  85                                         format = GL_RGB;
  86                                         internal_format = GL_RGB8;
  87                                 }
  88                         } else if (channel == 1 && ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
  89                                 format = GL_RG;
  90                                 if (type == GL_UNSIGNED_SHORT) {
  91                                         internal_format = GL_RG16;
  92                                 } else {
  93                                         assert(type == GL_UNSIGNED_BYTE);
  94                                         internal_format = GL_RG8;
  95                                 }
  96                         } else {
  97                                 format = GL_RED;
  98                                 if (type == GL_UNSIGNED_SHORT) {
  99                                         internal_format = GL_R16;
 100                                 } else {
 101                                         assert(type == GL_UNSIGNED_BYTE);
 102                                         internal_format = GL_R8;
 103                                 }
 104                         }
 105
 106                         // (Re-)upload the texture.
 107                         texture_num[channel] = resource_pool->create_2d_texture(internal_format, widths[channel], heights[channel]);
 108                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
 109                         check_error();
 110                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
 111                         check_error();
 112                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbos[channel]);
 113                         check_error();
 114                         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 115                         check_error();
 116                         glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch[channel]);
 117                         check_error();
 118                         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, widths[channel], heights[channel], format, type, pixel_data[channel]);
 119                         check_error();
 120                         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 121                         check_error();
 122                         if (needs_mipmaps) {
 123                                 glGenerateMipmap(GL_TEXTURE_2D);
 124                                 check_error();
 125                         }
 126                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 127                         check_error();
 128                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 129                         check_error();
 130                         owns_texture[channel] = true;
 131                 } else {
 132                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
 133                         check_error();
 134                 }
 135         }
 136
 137         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 138         check_error();
 139
 140         // Bind samplers.
 141         uniform_tex_y = *sampler_num + 0;
 142         if (ycbcr_input_splitting != YCBCR_INPUT_INTERLEAVED) {
 143                 uniform_tex_cb = *sampler_num + 1;
 144         }
 145         if (ycbcr_input_splitting == YCBCR_INPUT_PLANAR) {
 146                 uniform_tex_cr = *sampler_num + 2;
 147         }
 148
 149         *sampler_num += num_channels;
 150 }
 151
 152 string YCbCrInput::output_fragment_shader()
 153 {
 154         float offset[3];
 155         Matrix3d ycbcr_to_rgb;
 156         compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb, type);
 157
 158         string frag_shader;
 159
 160         frag_shader = output_glsl_mat3("PREFIX(inv_ycbcr_matrix)", ycbcr_to_rgb);
 161         frag_shader += output_glsl_vec3("PREFIX(offset)", offset[0], offset[1], offset[2]);
 162
 163         float cb_offset_x = compute_chroma_offset(
 164                 ycbcr_format.cb_x_position, ycbcr_format.chroma_subsampling_x, widths[1]);
 165         float cb_offset_y = compute_chroma_offset(
 166                 ycbcr_format.cb_y_position, ycbcr_format.chroma_subsampling_y, heights[1]);
 167         frag_shader += output_glsl_vec2("PREFIX(cb_offset)", cb_offset_x, cb_offset_y);
 168
 169         float cr_offset_x = compute_chroma_offset(
 170                 ycbcr_format.cr_x_position, ycbcr_format.chroma_subsampling_x, widths[2]);
 171         float cr_offset_y = compute_chroma_offset(
 172                 ycbcr_format.cr_y_position, ycbcr_format.chroma_subsampling_y, heights[2]);
 173         frag_shader += output_glsl_vec2("PREFIX(cr_offset)", cr_offset_x, cr_offset_y);
 174
 175         if (ycbcr_input_splitting == YCBCR_INPUT_INTERLEAVED) {
 176                 frag_shader += "#define Y_CB_CR_SAME_TEXTURE 1\n";
 177         } else if (ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
 178                 char buf[256];
 179                 snprintf(buf, sizeof(buf), "#define Y_CB_CR_SAME_TEXTURE 0\n#define CB_CR_SAME_TEXTURE 1\n#define CB_CR_OFFSETS_EQUAL %d\n",
 180                         (fabs(ycbcr_format.cb_x_position - ycbcr_format.cr_x_position) < 1e-6));
 181                 frag_shader += buf;
 182         } else {
 183                 frag_shader += "#define Y_CB_CR_SAME_TEXTURE 0\n#define CB_CR_SAME_TEXTURE 0\n";
 184         }
 185
 186         frag_shader += read_file("ycbcr_input.frag");
 187         return frag_shader;
 188 }
 189
 190 void YCbCrInput::invalidate_pixel_data()
 191 {
 192         for (unsigned channel = 0; channel < 3; ++channel) {
 193                 possibly_release_texture(channel);
 194         }
 195 }
 196
 197 bool YCbCrInput::set_int(const std::string& key, int value)
 198 {
 199         if (key == "needs_mipmaps") {
 200                 if (ycbcr_input_splitting != YCBCR_INPUT_INTERLEAVED && value != 0) {
 201                         // We do not currently support this.
 202                         return false;
 203                 }
 204         }
 205         return Effect::set_int(key, value);
 206 }
 207
 208 void YCbCrInput::possibly_release_texture(unsigned channel)
 209 {
 210         if (texture_num[channel] != 0 && owns_texture[channel]) {
 211                 resource_pool->release_2d_texture(texture_num[channel]);
 212                 texture_num[channel] = 0;
 213                 owns_texture[channel] = false;
 214         }
 215 }
 216
 217 }  // namespace movit