git.sesse.net Git - movit/blob - ycbcr_422interleaved_input.cpp

   1 #include <epoxy/gl.h>
   2 #include <assert.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #include "effect_util.h"
   7 #include "resource_pool.h"
   8 #include "util.h"
   9 #include "ycbcr.h"
  10 #include "ycbcr_422interleaved_input.h"
  11
  12 using namespace Eigen;
  13 using namespace std;
  14
  15 namespace movit {
  16
  17 YCbCr422InterleavedInput::YCbCr422InterleavedInput(const ImageFormat &image_format,
  18                                                    const YCbCrFormat &ycbcr_format,
  19                                                    unsigned width, unsigned height)
  20         : image_format(image_format),
  21           ycbcr_format(ycbcr_format),
  22           width(width),
  23           height(height),
  24           resource_pool(nullptr)
  25 {
  26         pbo = 0;
  27         texture_num[0] = texture_num[1] = 0;
  28
  29         assert(ycbcr_format.chroma_subsampling_x == 2);
  30         assert(ycbcr_format.chroma_subsampling_y == 1);
  31         assert(width % ycbcr_format.chroma_subsampling_x == 0);
  32
  33         widths[CHANNEL_LUMA] = width;
  34         widths[CHANNEL_CHROMA] = width / ycbcr_format.chroma_subsampling_x;
  35         pitches[CHANNEL_LUMA] = width;
  36         pitches[CHANNEL_CHROMA] = width / ycbcr_format.chroma_subsampling_x;
  37
  38         pixel_data = nullptr;
  39
  40         register_uniform_sampler2d("tex_y", &uniform_tex_y);
  41         register_uniform_sampler2d("tex_cbcr", &uniform_tex_cbcr);
  42 }
  43
  44 YCbCr422InterleavedInput::~YCbCr422InterleavedInput()
  45 {
  46         for (unsigned channel = 0; channel < 2; ++channel) {
  47                 if (texture_num[channel] != 0) {
  48                         resource_pool->release_2d_texture(texture_num[channel]);
  49                 }
  50         }
  51 }
  52
  53 void YCbCr422InterleavedInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  54 {
  55         for (unsigned channel = 0; channel < 2; ++channel) {
  56                 glActiveTexture(GL_TEXTURE0 + *sampler_num + channel);
  57                 check_error();
  58
  59                 if (texture_num[channel] == 0) {
  60                         // (Re-)upload the texture.
  61                         GLuint format, internal_format;
  62                         if (channel == CHANNEL_LUMA) {
  63                                 format = GL_RG;
  64                                 internal_format = GL_RG8;
  65                         } else {
  66                                 assert(channel == CHANNEL_CHROMA);
  67                                 format = GL_RGBA;
  68                                 internal_format = GL_RGBA8;
  69                         }
  70
  71                         texture_num[channel] = resource_pool->create_2d_texture(internal_format, widths[channel], height);
  72                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
  73                         check_error();
  74                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  75                         check_error();
  76                         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
  77                         check_error();
  78                         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  79                         check_error();
  80                         glPixelStorei(GL_UNPACK_ROW_LENGTH, pitches[channel]);
  81                         check_error();
  82                         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, widths[channel], height, format, GL_UNSIGNED_BYTE, pixel_data);
  83                         check_error();
  84                         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  85                         check_error();
  86                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  87                         check_error();
  88                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  89                         check_error();
  90                 } else {
  91                         glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
  92                         check_error();
  93                 }
  94         }
  95
  96         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
  97         check_error();
  98
  99         // Bind samplers.
 100         uniform_tex_y = *sampler_num + 0;
 101         uniform_tex_cbcr = *sampler_num + 1;
 102
 103         *sampler_num += 2;
 104 }
 105
 106 string YCbCr422InterleavedInput::output_fragment_shader()
 107 {
 108         float offset[3];
 109         Matrix3d ycbcr_to_rgb;
 110         compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
 111
 112         string frag_shader;
 113
 114         frag_shader = output_glsl_mat3("PREFIX(inv_ycbcr_matrix)", ycbcr_to_rgb);
 115         frag_shader += output_glsl_vec3("PREFIX(offset)", offset[0], offset[1], offset[2]);
 116
 117         float cb_offset_x = compute_chroma_offset(
 118                 ycbcr_format.cb_x_position, ycbcr_format.chroma_subsampling_x, widths[CHANNEL_CHROMA]);
 119         float cr_offset_x = compute_chroma_offset(
 120                 ycbcr_format.cr_x_position, ycbcr_format.chroma_subsampling_x, widths[CHANNEL_CHROMA]);
 121         frag_shader += output_glsl_float("PREFIX(cb_offset_x)", cb_offset_x);
 122         frag_shader += output_glsl_float("PREFIX(cr_offset_x)", cr_offset_x);
 123
 124         char buf[256];
 125         sprintf(buf, "#define CB_CR_OFFSETS_EQUAL %d\n",
 126                 (fabs(ycbcr_format.cb_x_position - ycbcr_format.cr_x_position) < 1e-6));
 127         frag_shader += buf;
 128
 129         frag_shader += read_file("ycbcr_422interleaved_input.frag");
 130         return frag_shader;
 131 }
 132
 133 void YCbCr422InterleavedInput::invalidate_pixel_data()
 134 {
 135         for (unsigned channel = 0; channel < 2; ++channel) {
 136                 if (texture_num[channel] != 0) {
 137                         resource_pool->release_2d_texture(texture_num[channel]);
 138                         texture_num[channel] = 0;
 139                 }
 140         }
 141 }
 142
 143 bool YCbCr422InterleavedInput::set_int(const std::string& key, int value)
 144 {
 145         if (key == "needs_mipmaps") {
 146                 // We currently do not support this.
 147                 return (value == 0);
 148         }
 149         return Effect::set_int(key, value);
 150 }
 151
 152 }  // namespace movit