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feat: double buffered video input

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klemek
2025-11-24 18:50:50 +01:00
parent aa42e9d2aa
commit c66a5c166e
16 changed files with 162 additions and 82 deletions
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src/shaders.c
+32 -8
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@@ -88,8 +88,10 @@ static void rebind_textures(const ShaderProgram *program) {
#ifdef VIDEO_IN
static void link_input_to_texture(ShaderProgram *program, VideoCapture *input,
unsigned int texture_index) {
input->dma_image = EGL_NO_IMAGE_KHR;
unsigned int texture_index, bool swap) {
EGLImageKHR dma_image;
dma_image = EGL_NO_IMAGE_KHR;
// https://registry.khronos.org/EGL/extensions/EXT/EGL_EXT_image_dma_buf_import.txt
const EGLint attrib_list[] = {EGL_WIDTH,
@@ -99,18 +101,23 @@ static void link_input_to_texture(ShaderProgram *program, VideoCapture *input,
EGL_LINUX_DRM_FOURCC_EXT,
input->pixelformat,
EGL_DMA_BUF_PLANE0_FD_EXT,
input->exp_fd,
swap ? input->exp_fd_swap : input->exp_fd,
EGL_DMA_BUF_PLANE0_OFFSET_EXT,
0,
EGL_DMA_BUF_PLANE0_PITCH_EXT,
input->bytesperline,
EGL_NONE};
input->dma_image =
eglCreateImageKHR(program->egl_display, EGL_NO_CONTEXT,
EGL_LINUX_DMA_BUF_EXT, NULL, attrib_list);
dma_image = eglCreateImageKHR(program->egl_display, EGL_NO_CONTEXT,
EGL_LINUX_DMA_BUF_EXT, NULL, attrib_list);
if (input->dma_image == EGL_NO_IMAGE_KHR) {
if (swap) {
input->dma_image_swap = dma_image;
} else {
input->dma_image = dma_image;
}
if (dma_image == EGL_NO_IMAGE_KHR) {
log_error("(%s) eglCreateImageKHR failed %04x", input->name, eglGetError());
return;
}
@@ -137,7 +144,12 @@ static void init_input(ShaderProgram *program, const ConfigFile *config,
if (i < inputs->length && !inputs->values[i].error) {
snprintf(name, STR_LEN, "IN_%d_OUT", i + 1);
tex_i = config_file_get_int(config, name, 0);
link_input_to_texture(program, &inputs->values[i], tex_i);
link_input_to_texture(program, &inputs->values[i], tex_i, false);
if (inputs->values[i].with_swap) {
snprintf(name, STR_LEN, "IN_%d_SWAP_OUT", i + 1);
tex_i = config_file_get_int(config, name, 0);
link_input_to_texture(program, &inputs->values[i], tex_i, true);
}
} else {
log_warn("Cannot link input %d", i + 1);
}
@@ -321,6 +333,13 @@ static void init_single_program(ShaderProgram *program, unsigned int i,
glGetUniformLocation(program->programs[i], name);
}
prefix = config_file_get_str(config, "UNIFORM_IN_SWAP_PREFIX", "iInputSwap");
for (unsigned int j = 0; j < program->in_count; j++) {
snprintf(name, STR_LEN, "%s%d", prefix, j + 1);
program->iinswap_locations[i * program->in_count + j] =
glGetUniformLocation(program->programs[i], name);
}
prefix = config_file_get_str(config, "UNIFORM_SEED_PREFIX", "iSeed");
for (unsigned int j = 0; j < program->frag_count; j++) {
snprintf(name, STR_LEN, "%s%d", prefix, j + 1);
@@ -491,6 +510,8 @@ static void use_program(const ShaderProgram *program, int i, bool output,
context->input_formats[j]);
write_uniform_1i(program->iinfps_locations[i * program->in_count + j],
context->input_fps[j]);
write_uniform_1i(program->iinswap_locations[i * program->in_count + j],
context->input_swap[j] ? 1 : 0);
}
// set seeds uniforms
@@ -673,5 +694,8 @@ void shaders_free_input(const ShaderProgram *program,
if (!input->error && input->dma_image != EGL_NO_IMAGE_KHR) {
eglDestroyImageKHR(program->egl_display, input->dma_image);
}
if (!input->error && input->dma_image_swap != EGL_NO_IMAGE_KHR) {
eglDestroyImageKHR(program->egl_display, input->dma_image_swap);
}
#endif /* VIDEO_IN */
}