8 #include "effect_util.h"
9 #include "resource_pool.h"
12 #include "ycbcr_input.h"
14 using namespace Eigen;
19 YCbCrInput::YCbCrInput(const ImageFormat &image_format,
20 const YCbCrFormat &ycbcr_format,
21 unsigned width, unsigned height,
22 YCbCrInputSplitting ycbcr_input_splitting,
24 : image_format(image_format),
25 ycbcr_format(ycbcr_format),
26 ycbcr_input_splitting(ycbcr_input_splitting),
33 pbos[0] = pbos[1] = pbos[2] = 0;
34 texture_num[0] = texture_num[1] = texture_num[2] = 0;
39 pixel_data[0] = pixel_data[1] = pixel_data[2] = NULL;
40 owns_texture[0] = owns_texture[1] = owns_texture[2] = false;
42 register_uniform_sampler2d("tex_y", &uniform_tex_y);
44 if (ycbcr_input_splitting == YCBCR_INPUT_INTERLEAVED) {
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) {
50 register_uniform_sampler2d("tex_cbcr", &uniform_tex_cb);
52 assert(ycbcr_input_splitting == YCBCR_INPUT_PLANAR);
54 register_uniform_sampler2d("tex_cb", &uniform_tex_cb);
55 register_uniform_sampler2d("tex_cr", &uniform_tex_cr);
58 register_int("needs_mipmaps", &needs_mipmaps);
61 YCbCrInput::~YCbCrInput()
63 for (unsigned channel = 0; channel < num_channels; ++channel) {
64 possibly_release_texture(channel);
68 void YCbCrInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
70 for (unsigned channel = 0; channel < num_channels; ++channel) {
71 glActiveTexture(GL_TEXTURE0 + *sampler_num + channel);
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) {
79 internal_format = GL_RGB10_A2;
80 } else if (type == GL_UNSIGNED_SHORT) {
82 internal_format = GL_RGB16;
84 assert(type == GL_UNSIGNED_BYTE);
86 internal_format = GL_RGB8;
88 } else if (channel == 1 && ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
90 if (type == GL_UNSIGNED_SHORT) {
91 internal_format = GL_RG16;
93 assert(type == GL_UNSIGNED_BYTE);
94 internal_format = GL_RG8;
98 if (type == GL_UNSIGNED_SHORT) {
99 internal_format = GL_R16;
101 assert(type == GL_UNSIGNED_BYTE);
102 internal_format = GL_R8;
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]);
110 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
112 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbos[channel]);
114 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
116 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch[channel]);
118 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, widths[channel], heights[channel], format, type, pixel_data[channel]);
120 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
123 glGenerateMipmap(GL_TEXTURE_2D);
126 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
128 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
130 owns_texture[channel] = true;
132 glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
137 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
141 uniform_tex_y = *sampler_num + 0;
142 if (ycbcr_input_splitting != YCBCR_INPUT_INTERLEAVED) {
143 uniform_tex_cb = *sampler_num + 1;
145 if (ycbcr_input_splitting == YCBCR_INPUT_PLANAR) {
146 uniform_tex_cr = *sampler_num + 2;
149 *sampler_num += num_channels;
152 string YCbCrInput::output_fragment_shader()
155 Matrix3d ycbcr_to_rgb;
156 compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
158 if (type == GL_UNSIGNED_SHORT) {
159 // For 10-bit or 12-bit packed into 16-bit, we need to scale the values
160 // so that the max value goes from 1023 (or 4095) to 65535. We do this
161 // by folding the scaling into the conversion matrix, so it comes essentially
162 // for free. However, the offset is before the scaling (and thus assumes
163 // correctly scaled values), so we need to adjust that the other way.
164 double scale = 65535.0 / (ycbcr_format.num_levels - 1);
168 ycbcr_to_rgb *= scale;
173 frag_shader = output_glsl_mat3("PREFIX(inv_ycbcr_matrix)", ycbcr_to_rgb);
174 frag_shader += output_glsl_vec3("PREFIX(offset)", offset[0], offset[1], offset[2]);
176 float cb_offset_x = compute_chroma_offset(
177 ycbcr_format.cb_x_position, ycbcr_format.chroma_subsampling_x, widths[1]);
178 float cb_offset_y = compute_chroma_offset(
179 ycbcr_format.cb_y_position, ycbcr_format.chroma_subsampling_y, heights[1]);
180 frag_shader += output_glsl_vec2("PREFIX(cb_offset)", cb_offset_x, cb_offset_y);
182 float cr_offset_x = compute_chroma_offset(
183 ycbcr_format.cr_x_position, ycbcr_format.chroma_subsampling_x, widths[2]);
184 float cr_offset_y = compute_chroma_offset(
185 ycbcr_format.cr_y_position, ycbcr_format.chroma_subsampling_y, heights[2]);
186 frag_shader += output_glsl_vec2("PREFIX(cr_offset)", cr_offset_x, cr_offset_y);
188 if (ycbcr_input_splitting == YCBCR_INPUT_INTERLEAVED) {
189 frag_shader += "#define Y_CB_CR_SAME_TEXTURE 1\n";
190 } else if (ycbcr_input_splitting == YCBCR_INPUT_SPLIT_Y_AND_CBCR) {
192 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",
193 (fabs(ycbcr_format.cb_x_position - ycbcr_format.cr_x_position) < 1e-6));
196 frag_shader += "#define Y_CB_CR_SAME_TEXTURE 0\n#define CB_CR_SAME_TEXTURE 0\n";
199 frag_shader += read_file("ycbcr_input.frag");
203 void YCbCrInput::invalidate_pixel_data()
205 for (unsigned channel = 0; channel < 3; ++channel) {
206 possibly_release_texture(channel);
210 bool YCbCrInput::set_int(const std::string& key, int value)
212 if (key == "needs_mipmaps") {
213 if (ycbcr_input_splitting != YCBCR_INPUT_INTERLEAVED && value != 0) {
214 // We do not currently support this.
218 return Effect::set_int(key, value);
221 void YCbCrInput::possibly_release_texture(unsigned channel)
223 if (texture_num[channel] != 0 && owns_texture[channel]) {
224 resource_pool->release_2d_texture(texture_num[channel]);
225 texture_num[channel] = 0;
226 owns_texture[channel] = false;