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	render/vulkan: constrain blend to output subpass to redrawn region
This commit only applies to the render pass API.
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					 2 changed files with 57 additions and 4 deletions
				
			
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			@ -10,6 +10,7 @@
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#include <wlr/render/drm_format_set.h>
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#include <wlr/render/interface.h>
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#include <wlr/util/addon.h>
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#include "util/rect_union.h"
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struct wlr_vk_descriptor_pool;
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struct wlr_vk_texture;
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			@ -334,6 +335,7 @@ struct wlr_vk_render_pass {
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	struct wlr_vk_renderer *renderer;
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	struct wlr_vk_render_buffer *render_buffer;
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	struct wlr_vk_command_buffer *command_buffer;
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	struct rect_union updated_region;
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	VkPipeline bound_pipeline;
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	float projection[9];
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	bool failed;
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			@ -108,10 +108,16 @@ static bool render_pass_submit(struct wlr_render_pass *wlr_pass) {
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			VK_PIPELINE_BIND_POINT_GRAPHICS, renderer->output_pipe_layout,
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			0, 1, &render_buffer->blend_descriptor_set, 0, NULL);
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		vkCmdSetScissor(render_cb->vk, 0, 1, &(VkRect2D){
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			.extent = { width, height },
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		});
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		vkCmdDraw(render_cb->vk, 4, 1, 0, 0);
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		const pixman_region32_t *clip = rect_union_evaluate(&pass->updated_region);
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		int clip_rects_len;
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		const pixman_box32_t *clip_rects = pixman_region32_rectangles(
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			clip, &clip_rects_len);
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		for (int i = 0; i < clip_rects_len; i++) {
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			VkRect2D rect;
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			convert_pixman_box_to_vk_rect(&clip_rects[i], &rect);
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			vkCmdSetScissor(render_cb->vk, 0, 1, &rect);
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			vkCmdDraw(render_cb->vk, 4, 1, 0, 0);
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		}
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	}
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	vkCmdEndRenderPass(render_cb->vk);
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			@ -388,6 +394,7 @@ static bool render_pass_submit(struct wlr_render_pass *wlr_pass) {
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	}
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	wlr_buffer_unlock(render_buffer->wlr_buffer);
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	rect_union_finish(&pass->updated_region);
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	free(pass);
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	return true;
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			@ -396,6 +403,7 @@ error:
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	vulkan_reset_command_buffer(stage_cb);
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	vulkan_reset_command_buffer(render_cb);
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	wlr_buffer_unlock(render_buffer->wlr_buffer);
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	rect_union_finish(&pass->updated_region);
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	free(pass);
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	if (device_lost) {
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			@ -405,6 +413,21 @@ error:
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	return false;
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}
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static void render_pass_mark_box_updated(struct wlr_vk_render_pass *pass,
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		const struct wlr_box *box) {
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	if (!pass->render_buffer->blend_image) {
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		return;
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	}
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	pixman_box32_t pixman_box = {
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		.x1 = box->x,
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		.x2 = box->x + box->width,
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		.y1 = box->y,
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		.y2 = box->y + box->height,
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	};
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	rect_union_add(&pass->updated_region, pixman_box);
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}
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static void render_pass_add_rect(struct wlr_render_pass *wlr_pass,
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		const struct wlr_render_rect_options *options) {
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	struct wlr_vk_render_pass *pass = get_render_pass(wlr_pass);
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			@ -427,6 +450,20 @@ static void render_pass_add_rect(struct wlr_render_pass *wlr_pass,
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	int clip_rects_len;
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	const pixman_box32_t *clip_rects = pixman_region32_rectangles(&clip, &clip_rects_len);
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	// Record regions possibly updated for use in second subpass
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	for (int i = 0; i < clip_rects_len; i++) {
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		struct wlr_box clip_box = {
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			.x = clip_rects[i].x1,
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			.y = clip_rects[i].y1,
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			.width = clip_rects[i].x2 - clip_rects[i].x1,
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			.height = clip_rects[i].y2 - clip_rects[i].y1,
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		};
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		struct wlr_box intersection;
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		if (!wlr_box_intersection(&intersection, &options->box, &clip_box)) {
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			continue;
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		}
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		render_pass_mark_box_updated(pass, &intersection);
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	}
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	struct wlr_box box;
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	wlr_render_rect_options_get_box(options, pass->render_buffer->wlr_buffer, &box);
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			@ -590,6 +627,18 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
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		convert_pixman_box_to_vk_rect(&clip_rects[i], &rect);
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		vkCmdSetScissor(cb, 0, 1, &rect);
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		vkCmdDraw(cb, 4, 1, 0, 0);
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		struct wlr_box clip_box = {
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			.x = clip_rects[i].x1,
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			.y = clip_rects[i].y1,
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			.width = clip_rects[i].x2 - clip_rects[i].x1,
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			.height = clip_rects[i].y2 - clip_rects[i].y1,
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		};
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		struct wlr_box intersection;
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		if (!wlr_box_intersection(&intersection, &dst_box, &clip_box)) {
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			continue;
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		}
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		render_pass_mark_box_updated(pass, &intersection);
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	}
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	texture->last_used_cb = pass->command_buffer;
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			@ -610,6 +659,8 @@ struct wlr_vk_render_pass *vulkan_begin_render_pass(struct wlr_vk_renderer *rend
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	wlr_render_pass_init(&pass->base, &render_pass_impl);
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	pass->renderer = renderer;
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	rect_union_init(&pass->updated_region);
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	struct wlr_vk_command_buffer *cb = vulkan_acquire_command_buffer(renderer);
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	if (cb == NULL) {
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		free(pass);
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