renderer: Introduce wlr_scale_filter_mode

include/render/vulkan.h

@@ -125,6 +125,7 @@ void vulkan_format_props_finish(struct wlr_vk_format_props *props);
 
 struct wlr_vk_pipeline_layout_key {
 	const struct wlr_vk_format *ycbcr_format;
+	enum wlr_scale_filter_mode filter_mode;
 };
 
 struct wlr_vk_pipeline_layout {

include/wlr/render/wlr_renderer.h

@@ -196,6 +196,16 @@ enum wlr_render_blend_mode {
 	WLR_RENDER_BLEND_MODE_NONE,
 };
 
+/**
+ * Filter modes.
+ */
+enum wlr_scale_filter_mode {
+	/* bilinear texture filtering (default) */
+	WLR_SCALE_FILTER_BILINEAR,
+	/* nearest texture filtering */
+	WLR_SCALE_FILTER_NEAREST,
+};
+
 struct wlr_render_texture_options {
 	/* Source texture */
 	struct wlr_texture *texture;
@@ -209,6 +219,8 @@ struct wlr_render_texture_options {
 	const pixman_region32_t *clip;
 	/* Transform applied to the source texture */
 	enum wl_output_transform transform;
+	/* Filtering */
+	enum wlr_scale_filter_mode filter_mode;
 };
 
 /**

render/gles2/pass.c

@@ -170,7 +170,18 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
 
 	glActiveTexture(GL_TEXTURE0);
 	glBindTexture(texture->target, texture->tex);
-	glTexParameteri(texture->target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+	switch (options->filter_mode) {
+	case WLR_SCALE_FILTER_BILINEAR:
+		glTexParameteri(texture->target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(texture->target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		break;
+	case WLR_SCALE_FILTER_NEAREST:
+		glTexParameteri(texture->target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(texture->target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		break;
+	}
+
 	glUniform1i(shader->tex, 0);
 	glUniform1f(shader->alpha, alpha);
 	set_proj_matrix(shader->proj, pass->projection_matrix, &dst_box);

render/pixman/pass.c

@@ -120,6 +120,15 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
 		height = src_box.height;
 	}
 
+	switch (options->filter_mode) {
+	case WLR_SCALE_FILTER_BILINEAR:
+		pixman_image_set_filter(texture->image, PIXMAN_FILTER_BILINEAR, NULL, 0);
+		break;
+	case WLR_SCALE_FILTER_NEAREST:
+		pixman_image_set_filter(texture->image, PIXMAN_FILTER_NEAREST, NULL, 0);
+		break;
+	}
+
 	pixman_image_set_clip_region32(buffer->image, (pixman_region32_t *)options->clip);
 	pixman_image_composite32(PIXMAN_OP_OVER, texture->image, mask,
 		buffer->image, src_box.x, src_box.y, 0, 0, dest_x, dest_y,

render/vulkan/pass.c

@@ -547,6 +547,7 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
 			.source = WLR_VK_SHADER_SOURCE_TEXTURE,
 			.layout = {
 				.ycbcr_format = texture->format->is_ycbcr ? texture->format : NULL,
+				.filter_mode = options->filter_mode,
 			},
 			.texture_transform = texture->transform,
 		});

render/vulkan/renderer.c

@@ -2073,6 +2073,10 @@ static bool pipeline_layout_key_equals(
 	assert(!a->ycbcr_format || a->ycbcr_format->is_ycbcr);
 	assert(!b->ycbcr_format || b->ycbcr_format->is_ycbcr);
 
+	if (a->filter_mode != b->filter_mode) {
+		return false;
+	}
+
 	if (a->ycbcr_format != b->ycbcr_format) {
 		return false;
 	}
@@ -2384,12 +2388,21 @@ struct wlr_vk_pipeline_layout *get_or_create_pipeline_layout(
 	pipeline_layout->key = *key;
 
 	VkResult res;
+	VkFilter filter;
+	switch (key->filter_mode) {
+	case WLR_SCALE_FILTER_BILINEAR:
+		filter = VK_FILTER_LINEAR;
+		break;
+	case WLR_SCALE_FILTER_NEAREST:
+		filter = VK_FILTER_NEAREST;
+		break;
+	}
 
 	VkSamplerYcbcrConversionInfo conversion_info;
 	VkSamplerCreateInfo sampler_create_info = {
 		.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
-		.magFilter = VK_FILTER_LINEAR,
+		.magFilter = filter,
-		.minFilter = VK_FILTER_LINEAR,
+		.minFilter = filter,
 		.mipmapMode = VK_SAMPLER_MIPMAP_MODE_NEAREST,
 		.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
 		.addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,