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