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Allow redirecting rendering to a FBO

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Kovid Goyal
2025-08-05 11:55:05 +05:30
parent 2eb5d4deca
commit 8adc838aed
3 changed files with 18 additions and 4 deletions
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12
kitty/gl.c
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@@ -119,6 +119,18 @@ free_framebuffer(GLuint *fb_id) {
*fb_id = 0; *fb_id = 0;
} }
static GLuint output_framebuffer = 0;
void
bind_framebuffer_for_output(unsigned fbid) {
glBindFramebuffer(GL_FRAMEBUFFER, fbid || output_framebuffer);
}
void
set_framebuffer_to_use_for_output(unsigned fbid) {
output_framebuffer = fbid;
}
static struct { static struct {
GLsizei items[16][4]; GLsizei items[16][4];
size_t used; size_t used;

2
kitty/gl.h
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@@ -61,3 +61,5 @@ void save_viewport_using_top_left_origin(GLsizei x, GLsizei y, GLsizei width, GL
void save_viewport_using_bottom_left_origin(GLsizei x, GLsizei y, GLsizei width, GLsizei height); void save_viewport_using_bottom_left_origin(GLsizei x, GLsizei y, GLsizei width, GLsizei height);
void check_framebuffer_status_or_die(void); void check_framebuffer_status_or_die(void);
void restore_viewport(void); void restore_viewport(void);
void bind_framebuffer_for_output(unsigned fbid);
void set_framebuffer_to_use_for_output(unsigned fbid);

8
kitty/shaders.c
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@@ -673,12 +673,12 @@ ensure_layer_ready_to_render(const UIRenderData *ui, ScreenLayer *which) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, which->width, which->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, which->width, which->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindFramebuffer(GL_FRAMEBUFFER, which->framebuffer_id); bind_framebuffer_for_output(which->framebuffer_id);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, which->id, 0); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, which->id, 0);
check_framebuffer_status_or_die(); if (global_state.debug_rendering) check_framebuffer_status_or_die();
needs_redraw = true; needs_redraw = true;
} }
glBindFramebuffer(GL_FRAMEBUFFER, which->framebuffer_id); bind_framebuffer_for_output(which->framebuffer_id);
return needs_redraw; return needs_redraw;
} }
@@ -979,7 +979,7 @@ update_screen_layers(UIRenderData *ui) {
ui->has_under_fg = update_under_fg_layer(ui); ui->has_under_fg = update_under_fg_layer(ui);
ui->has_over_fg = update_over_fg_layer(ui); ui->has_over_fg = update_over_fg_layer(ui);
ui->has_ui = update_ui_layer(ui); ui->has_ui = update_ui_layer(ui);
glBindFramebuffer(GL_FRAMEBUFFER, 0); bind_framebuffer_for_output(0);
restore_viewport(); restore_viewport();
} }