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Make code to load alpha mask texture re-useable

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This commit is contained in:
Kovid Goyal
2021-11-01 07:29:04 +05:30
parent ddfa653197
commit e7386735f4
1 changed files with 11 additions and 5 deletions
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16
kitty/shaders.c
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@@ -454,10 +454,9 @@ draw_graphics(int program, ssize_t vao_idx, ssize_t gvao_idx, ImageRenderData *d
#define BLEND_ONTO_OPAQUE glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // blending onto opaque colors
#define BLEND_PREMULT glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); // blending of pre-multiplied colors
void
draw_centered_alpha_mask(OSWindow *os_window, size_t screen_width, size_t screen_height, size_t width, size_t height, uint8_t *canvas) {
static ImageRenderData*
load_alpha_mask_texture(size_t width, size_t height, uint8_t *canvas) {
static ImageRenderData data = {.group_count=1};
gpu_data_for_centered_image(&data, screen_width, screen_height, width, height);
if (!data.texture_id) { glGenTextures(1, &data.texture_id); }
glBindTexture(GL_TEXTURE_2D, data.texture_id);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
@@ -466,13 +465,20 @@ draw_centered_alpha_mask(OSWindow *os_window, size_t screen_width, size_t screen
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, canvas);
return &data;
}
void
draw_centered_alpha_mask(OSWindow *os_window, size_t screen_width, size_t screen_height, size_t width, size_t height, uint8_t *canvas) {
ImageRenderData *data = load_alpha_mask_texture(width, height, canvas);
gpu_data_for_centered_image(data, screen_width, screen_height, width, height);
bind_program(GRAPHICS_ALPHA_MASK_PROGRAM);
glUniform1i(cell_uniform_data.amask_image_loc, GRAPHICS_UNIT);
#define CV3(x) (((float)((x >> 16) & 0xff))/255.f), (((float)((x >> 8) & 0xff))/255.f), (((float)(x & 0xff))/255.f)
glUniform3f(cell_uniform_data.amask_fg_loc, CV3(OPT(foreground)));
#undef CV3
glUniform1f(cell_uniform_data.amask_premult_loc, os_window->is_semi_transparent ? 1.f : 0.f);
send_graphics_data_to_gpu(1, os_window->gvao_idx, &data);
send_graphics_data_to_gpu(1, os_window->gvao_idx, data);
glEnable(GL_BLEND);
if (os_window->is_semi_transparent) {
BLEND_PREMULT;
@@ -480,7 +486,7 @@ draw_centered_alpha_mask(OSWindow *os_window, size_t screen_width, size_t screen
BLEND_ONTO_OPAQUE;
}
glScissor(0, 0, screen_width, screen_height);
draw_graphics(GRAPHICS_ALPHA_MASK_PROGRAM, 0, os_window->gvao_idx, &data, 0, 1);
draw_graphics(GRAPHICS_ALPHA_MASK_PROGRAM, 0, os_window->gvao_idx, data, 0, 1);
glDisable(GL_BLEND);
}