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#include <epoxy/gl.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "effect_util.h"
#include "resource_pool.h"
#include "util.h"
#include "ycbcr.h"
#include "ycbcr_422interleaved_input.h"
using namespace Eigen;
using namespace std;
namespace movit {
YCbCr422InterleavedInput::YCbCr422InterleavedInput(const ImageFormat &image_format,
const YCbCrFormat &ycbcr_format,
unsigned width, unsigned height)
: image_format(image_format),
ycbcr_format(ycbcr_format),
width(width),
height(height),
resource_pool(nullptr)
{
pbo = 0;
texture_num[0] = texture_num[1] = 0;
assert(ycbcr_format.chroma_subsampling_x == 2);
assert(ycbcr_format.chroma_subsampling_y == 1);
assert(width % ycbcr_format.chroma_subsampling_x == 0);
widths[CHANNEL_LUMA] = width;
widths[CHANNEL_CHROMA] = width / ycbcr_format.chroma_subsampling_x;
pitches[CHANNEL_LUMA] = width;
pitches[CHANNEL_CHROMA] = width / ycbcr_format.chroma_subsampling_x;
pixel_data = nullptr;
register_uniform_sampler2d("tex_y", &uniform_tex_y);
register_uniform_sampler2d("tex_cbcr", &uniform_tex_cbcr);
}
YCbCr422InterleavedInput::~YCbCr422InterleavedInput()
{
for (unsigned channel = 0; channel < 2; ++channel) {
if (texture_num[channel] != 0) {
resource_pool->release_2d_texture(texture_num[channel]);
}
}
}
void YCbCr422InterleavedInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
{
for (unsigned channel = 0; channel < 2; ++channel) {
glActiveTexture(GL_TEXTURE0 + *sampler_num + channel);
check_error();
if (texture_num[channel] == 0) {
// (Re-)upload the texture.
GLuint format, internal_format;
if (channel == CHANNEL_LUMA) {
format = GL_RG;
internal_format = GL_RG8;
} else {
assert(channel == CHANNEL_CHROMA);
format = GL_RGBA;
internal_format = GL_RGBA8;
}
texture_num[channel] = resource_pool->create_2d_texture(internal_format, widths[channel], height);
glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
check_error();
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
check_error();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
check_error();
glPixelStorei(GL_UNPACK_ROW_LENGTH, pitches[channel]);
check_error();
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, widths[channel], height, format, GL_UNSIGNED_BYTE, pixel_data);
check_error();
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
check_error();
} else {
glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
check_error();
}
}
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
check_error();
// Bind samplers.
uniform_tex_y = *sampler_num + 0;
uniform_tex_cbcr = *sampler_num + 1;
*sampler_num += 2;
}
string YCbCr422InterleavedInput::output_fragment_shader()
{
float offset[3];
Matrix3d ycbcr_to_rgb;
compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
string frag_shader;
frag_shader = output_glsl_mat3("PREFIX(inv_ycbcr_matrix)", ycbcr_to_rgb);
frag_shader += output_glsl_vec3("PREFIX(offset)", offset[0], offset[1], offset[2]);
float cb_offset_x = compute_chroma_offset(
ycbcr_format.cb_x_position, ycbcr_format.chroma_subsampling_x, widths[CHANNEL_CHROMA]);
float cr_offset_x = compute_chroma_offset(
ycbcr_format.cr_x_position, ycbcr_format.chroma_subsampling_x, widths[CHANNEL_CHROMA]);
frag_shader += output_glsl_float("PREFIX(cb_offset_x)", cb_offset_x);
frag_shader += output_glsl_float("PREFIX(cr_offset_x)", cr_offset_x);
char buf[256];
sprintf(buf, "#define CB_CR_OFFSETS_EQUAL %d\n",
(fabs(ycbcr_format.cb_x_position - ycbcr_format.cr_x_position) < 1e-6));
frag_shader += buf;
frag_shader += read_file("ycbcr_422interleaved_input.frag");
return frag_shader;
}
void YCbCr422InterleavedInput::invalidate_pixel_data()
{
for (unsigned channel = 0; channel < 2; ++channel) {
if (texture_num[channel] != 0) {
resource_pool->release_2d_texture(texture_num[channel]);
texture_num[channel] = 0;
}
}
}
bool YCbCr422InterleavedInput::set_int(const std::string& key, int value)
{
if (key == "needs_mipmaps") {
// We currently do not support this.
return (value == 0);
}
return Effect::set_int(key, value);
}
} // namespace movit
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