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Make each OS window have its own framebuffer

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This commit fixes graphics rendering when more than one OS window is
open, all OS windows are semi-transparent, and multiple windows contain
graphics.

This commit closes #2310.
This commit is contained in:
Fredrick Brennan
2020-01-24 16:06:57 +08:00
parent 1b5daf930a
commit 65a7b19f40
6 changed files with 13 additions and 3 deletions
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5
kitty/shaders.c
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@@ -154,7 +154,6 @@ typedef struct {
} CellProgramLayout;
static CellProgramLayout cell_program_layouts[NUM_PROGRAMS];
static GLuint offscreen_framebuffer = 0;
static ssize_t blit_vertex_array;
static void
@@ -173,7 +172,6 @@ init_cell_program(void) {
C(p, colors, 0); C(p, sprite_coords, 1); C(p, is_selected, 2);
}
#undef C
glGenFramebuffers(1, &offscreen_framebuffer);
blit_vertex_array = create_vao();
}
@@ -424,6 +422,7 @@ draw_cells_interleaved(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen) {
static void
draw_cells_interleaved_premult(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen, OSWindow *os_window) {
if (!os_window->offscreen_texture_id) {
glGenFramebuffers(1, &os_window->offscreen_framebuffer);
glGenTextures(1, &os_window->offscreen_texture_id);
glBindTexture(GL_TEXTURE_2D, os_window->offscreen_texture_id);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, os_window->viewport_width, os_window->viewport_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
@@ -433,7 +432,7 @@ draw_cells_interleaved_premult(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, offscreen_framebuffer);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, os_window->offscreen_framebuffer);
glFramebufferTexture(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, os_window->offscreen_texture_id, 0);
/* if (glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) fatal("Offscreen framebuffer not complete"); */
bind_program(CELL_BG_PROGRAM);