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Do image clipping using OpenGL rather than on the CPU

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Kovid Goyal
2017-10-07 10:08:26 +05:30
parent 3a344d86fe
commit d5088a3e5b
3 changed files with 13 additions and 8 deletions
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11
kitty/shaders.c
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@@ -313,6 +313,7 @@ draw_graphics(ImageRenderData *data, GLuint start, GLuint count) {
glActiveTexture(GL_TEXTURE0 + GRAPHICS_UNIT); check_gl();
GLuint base = 4 * start;
glEnable(GL_SCISSOR_TEST);
for (GLuint i=0; i < count;) {
ImageRenderData *rd = data + start + i;
glBindTexture(GL_TEXTURE_2D, rd->texture_id); check_gl();
@@ -321,6 +322,7 @@ draw_graphics(ImageRenderData *data, GLuint start, GLuint count) {
// before implementing it.
for (GLuint k=0; k < rd->group_count; k++, base += 4, i++) glDrawArrays(GL_TRIANGLE_FAN, base, 4);
}
glDisable(GL_SCISSOR_TEST);
}
@@ -354,6 +356,15 @@ draw_cells_interleaved(Screen *screen) {
static void
draw_cells_impl(ssize_t vao_idx, GLfloat xstart, GLfloat ystart, GLfloat dx, GLfloat dy, Screen *screen, CursorRenderInfo *cursor) {
GLfloat h = (GLfloat)screen->lines * dy;
#define SCALE(w, x) ((GLfloat)(global_state.viewport_##w) * (GLfloat)(x))
glScissor(
(GLint)(SCALE(width, (xstart + 1.0f) / 2.0f)),
(GLint)(SCALE(height, ((ystart - h) + 1.0f) / 2.0f)),
(GLsizei)(ceilf(SCALE(width, (float)screen->columns * dx / 2.0f))),
(GLsizei)(ceilf(SCALE(height, h / 2.0f)))
);
#undef SCALE
cell_prepare_to_render(vao_idx, screen, xstart, ystart, dx, dy, cursor);
if (screen->grman->num_of_negative_refs) draw_cells_interleaved(screen);
else draw_all_cells(screen);