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Merge branch 'gles2-tbr-scissor-master' into 'master'

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render/gles2: add scissor-based clipping for tile-based renderers

See merge request wlroots/wlroots!5295
This commit is contained in:
José María Casanova Crespo 2026-06-08 19:48:42 +02:00
commit 7e776b7359
3 changed files with 59 additions and 27 deletions
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78
render/gles2/pass.c
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@ -75,7 +75,7 @@ out:
return ok;
}
static void render(const struct wlr_box *box, const pixman_region32_t *clip, GLint attrib) {
static void render(const struct wlr_box *box, const pixman_region32_t *clip, GLint attrib, bool scissor) {
pixman_region32_t region;
pixman_region32_init_rect(&region, box->x, box->y, box->width, box->height);
@ -92,31 +92,55 @@ static void render(const struct wlr_box *box, const pixman_region32_t *clip, GLi
glEnableVertexAttribArray(attrib);
for (int i = 0; i < rects_len;) {
int batch = rects_len - i < MAX_QUADS ? rects_len - i : MAX_QUADS;
int batch_end = batch + i;
size_t vert_index = 0;
GLfloat verts[MAX_QUADS * 6 * 2];
for (; i < batch_end; i++) {
const pixman_box32_t *rect = &rects[i];
verts[vert_index++] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y2 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y2 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y2 - box->y) / box->height;
}
if (scissor) {
GLfloat verts[12];
glVertexAttribPointer(attrib, 2, GL_FLOAT, GL_FALSE, 0, verts);
glDrawArrays(GL_TRIANGLES, 0, batch * 6);
glEnable(GL_SCISSOR_TEST);
for (int i = 0; i < rects_len; i++) {
const pixman_box32_t *rect = &rects[i];
verts[0] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[1] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[2] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[3] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[4] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[5] = (GLfloat)(rect->y2 - box->y) / box->height;
verts[6] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[7] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[8] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[9] = (GLfloat)(rect->y2 - box->y) / box->height;
verts[10] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[11] = (GLfloat)(rect->y2 - box->y) / box->height;
glScissor(rect->x1, rect->y1, rect->x2 - rect->x1, rect->y2 - rect->y1);
glDrawArrays(GL_TRIANGLES, 0, 6);
}
glDisable(GL_SCISSOR_TEST);
} else {
for (int i = 0; i < rects_len;) {
int batch = rects_len - i < MAX_QUADS ? rects_len - i : MAX_QUADS;
int batch_end = batch + i;
size_t vert_index = 0;
GLfloat verts[MAX_QUADS * 6 * 2];
for (; i < batch_end; i++) {
const pixman_box32_t *rect = &rects[i];
verts[vert_index++] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y2 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y1 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x2 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y2 - box->y) / box->height;
verts[vert_index++] = (GLfloat)(rect->x1 - box->x) / box->width;
verts[vert_index++] = (GLfloat)(rect->y2 - box->y) / box->height;
}
glVertexAttribPointer(attrib, 2, GL_FLOAT, GL_FALSE, 0, verts);
glDrawArrays(GL_TRIANGLES, 0, batch * 6);
}
}
glDisableVertexAttribArray(attrib);
@ -247,7 +271,7 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
set_proj_matrix(shader->proj, pass->projection_matrix, &dst_box);
set_tex_matrix(shader->tex_proj, options->transform, &src_fbox);
render(&dst_box, options->clip, shader->pos_attrib);
render(&dst_box, options->clip, shader->pos_attrib, renderer->scissor);
glBindTexture(texture->target, 0);
pop_gles2_debug(renderer);
@ -278,7 +302,7 @@ static void render_pass_add_rect(struct wlr_render_pass *wlr_pass,
glUseProgram(renderer->shaders.quad.program);
set_proj_matrix(renderer->shaders.quad.proj, pass->projection_matrix, &box);
glUniform4f(renderer->shaders.quad.color, color->r, color->g, color->b, color->a);
render(&box, options->clip, renderer->shaders.quad.pos_attrib);
render(&box, options->clip, renderer->shaders.quad.pos_attrib, renderer->scissor);
}
pop_gles2_debug(renderer);