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#include "../include/color_conversion.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#define MAX_SHADERS 2
#define MAX_FRAMEBUFFERS 2
#define ROTATE_Z "mat4 rotate_z(in float angle) {\n" \
" return mat4(cos(angle), -sin(angle), 0.0, 0.0,\n" \
" sin(angle), cos(angle), 0.0, 0.0,\n" \
" 0.0, 0.0, 1.0, 0.0,\n" \
" 0.0, 0.0, 0.0, 1.0);\n" \
"}\n"
#define RGB_TO_YUV "const mat4 RGBtoYUV = mat4(0.257, 0.439, -0.148, 0.0,\n" \
" 0.504, -0.368, -0.291, 0.0,\n" \
" 0.098, -0.071, 0.439, 0.0,\n" \
" 0.0625, 0.500, 0.500, 1.0);"
static int load_shader_y(gsr_shader *shader, gsr_egl *egl, float rotation) {
char vertex_shader[2048];
snprintf(vertex_shader, sizeof(vertex_shader),
"#version 300 es \n"
"in vec2 pos; \n"
"in vec2 texcoords; \n"
"out vec2 texcoords_out; \n"
ROTATE_Z
"void main() \n"
"{ \n"
" texcoords_out = texcoords; \n"
" gl_Position = vec4(pos.x, pos.y, 0.0, 1.0) * rotate_z(%f); \n"
"} \n", rotation);
char fragment_shader[] =
"#version 300 es \n"
"precision mediump float; \n"
"in vec2 texcoords_out; \n"
"uniform sampler2D tex1; \n"
"out vec4 FragColor; \n"
RGB_TO_YUV
"void main() \n"
"{ \n"
" FragColor.x = (RGBtoYUV * vec4(texture(tex1, texcoords_out).rgb, 1.0)).x; \n"
"} \n";
if(gsr_shader_init(shader, egl, vertex_shader, fragment_shader) != 0)
return -1;
gsr_shader_bind_attribute_location(shader, "pos", 0);
gsr_shader_bind_attribute_location(shader, "texcoords", 1);
return 0;
}
static unsigned int load_shader_uv(gsr_shader *shader, gsr_egl *egl, float rotation) {
char vertex_shader[2048];
snprintf(vertex_shader, sizeof(vertex_shader),
"#version 300 es \n"
"in vec2 pos; \n"
"in vec2 texcoords; \n"
"out vec2 texcoords_out; \n"
ROTATE_Z
"void main() \n"
"{ \n"
" texcoords_out = texcoords; \n"
" gl_Position = vec4(pos.x, pos.y, 0.0, 1.0) * rotate_z(%f) * vec4(0.5, 0.5, 1.0, 1.0) - vec4(0.5, 0.5, 0.0, 0.0); \n"
"} \n", rotation);
char fragment_shader[] =
"#version 300 es \n"
"precision mediump float; \n"
"in vec2 texcoords_out; \n"
"uniform sampler2D tex1; \n"
"out vec4 FragColor; \n"
RGB_TO_YUV
"void main() \n"
"{ \n"
" FragColor.xy = (RGBtoYUV * vec4(texture(tex1, texcoords_out).rgb, 1.0)).zy; \n"
"} \n";
if(gsr_shader_init(shader, egl, vertex_shader, fragment_shader) != 0)
return -1;
gsr_shader_bind_attribute_location(shader, "pos", 0);
gsr_shader_bind_attribute_location(shader, "texcoords", 1);
return 0;
}
static int loader_framebuffers(gsr_color_conversion *self) {
const unsigned int draw_buffer = GL_COLOR_ATTACHMENT0;
self->egl->glGenFramebuffers(MAX_FRAMEBUFFERS, self->framebuffers);
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, self->framebuffers[0]);
self->egl->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self->destination_textures[0], 0);
self->egl->glDrawBuffers(1, &draw_buffer);
if(self->egl->glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to create framebuffer for Y\n");
goto err;
}
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, self->framebuffers[1]);
self->egl->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self->destination_textures[1], 0);
self->egl->glDrawBuffers(1, &draw_buffer);
if(self->egl->glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to create framebuffer for UV\n");
goto err;
}
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, 0);
return 0;
err:
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, 0);
return -1;
}
static int create_vertices(gsr_color_conversion *self, vec2f position, vec2f size) {
const float vertices[] = {
-1.0f, 1.0f, position.x, position.y + size.y,
-1.0f, -1.0f, position.x, position.y,
1.0f, -1.0f, position.x + size.x, position.y,
-1.0f, 1.0f, position.x, position.y + size.y,
1.0f, -1.0f, position.x + size.x, position.y,
1.0f, 1.0f, position.x + size.x, position.y + size.y
};
self->egl->glGenVertexArrays(1, &self->vertex_array_object_id);
self->egl->glGenBuffers(1, &self->vertex_buffer_object_id);
self->egl->glBindVertexArray(self->vertex_array_object_id);
self->egl->glBindBuffer(GL_ARRAY_BUFFER, self->vertex_buffer_object_id);
self->egl->glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), &vertices, GL_STATIC_DRAW);
self->egl->glEnableVertexAttribArray(0);
self->egl->glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
self->egl->glEnableVertexAttribArray(1);
self->egl->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
self->egl->glBindVertexArray(0);
return 0;
}
int gsr_color_conversion_init(gsr_color_conversion *self, const gsr_color_conversion_params *params) {
assert(params);
assert(params->egl);
memset(self, 0, sizeof(*self));
self->egl = params->egl;
if(params->num_source_textures != 1) {
fprintf(stderr, "gsr error: gsr_color_conversion_init: expected 1 source texture for source color RGB, got %d source texture(s)\n", params->num_source_textures);
return -1;
}
if(params->num_destination_textures != 2) {
fprintf(stderr, "gsr error: gsr_color_conversion_init: expected 2 destination textures for destination color NV12, got %d destination texture(s)\n", params->num_destination_textures);
return -1;
}
if(load_shader_y(&self->shaders[0], self->egl, params->rotation) != 0) {
fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to loader Y shader\n");
goto err;
}
if(load_shader_uv(&self->shaders[1], self->egl, params->rotation) != 0) {
fprintf(stderr, "gsr error: gsr_color_conversion_init: failed to loader UV shader\n");
goto err;
}
self->source_textures[0] = params->source_textures[0];
self->destination_textures[0] = params->destination_textures[0];
self->destination_textures[1] = params->destination_textures[1];
if(loader_framebuffers(self) != 0)
goto err;
if(create_vertices(self, params->position, params->size) != 0)
goto err;
return 0;
err:
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, 0);
gsr_color_conversion_deinit(self);
return -1;
}
void gsr_color_conversion_deinit(gsr_color_conversion *self) {
if(self->vertex_buffer_object_id) {
self->egl->glDeleteBuffers(1, &self->vertex_buffer_object_id);
self->vertex_buffer_object_id = 0;
}
if(self->vertex_array_object_id) {
self->egl->glDeleteVertexArrays(1, &self->vertex_array_object_id);
self->vertex_array_object_id = 0;
}
self->egl->glDeleteFramebuffers(MAX_FRAMEBUFFERS, self->framebuffers);
for(int i = 0; i < MAX_FRAMEBUFFERS; ++i) {
self->framebuffers[i] = 0;
}
for(int i = 0; i < MAX_SHADERS; ++i) {
gsr_shader_deinit(&self->shaders[i]);
}
}
int gsr_color_conversion_update(gsr_color_conversion *self, int width, int height) {
self->egl->glBindVertexArray(self->vertex_array_object_id);
self->egl->glViewport(0, 0, width, height);
self->egl->glBindTexture(GL_TEXTURE_2D, self->source_textures[0]);
{
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, self->framebuffers[0]);
//cap_xcomp->egl.glClear(GL_COLOR_BUFFER_BIT);
gsr_shader_use(&self->shaders[0]);
self->egl->glDrawArrays(GL_TRIANGLES, 0, 6);
}
{
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, self->framebuffers[1]);
//cap_xcomp->egl.glClear(GL_COLOR_BUFFER_BIT);
gsr_shader_use(&self->shaders[1]);
self->egl->glDrawArrays(GL_TRIANGLES, 0, 6);
}
self->egl->glBindVertexArray(0);
gsr_shader_use_none(&self->shaders[0]);
self->egl->glBindTexture(GL_TEXTURE_2D, 0);
self->egl->glBindFramebuffer(GL_FRAMEBUFFER, 0);
return 0;
}
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