initial commit, 4.5 stable

servers/rendering/renderer_rd/shaders/effects/vrs.glsl

@@ -0,0 +1,93 @@
+#[vertex]
+
+#version 450
+
+#VERSION_DEFINES
+
+#ifdef USE_MULTIVIEW
+#extension GL_EXT_multiview : enable
+#define ViewIndex gl_ViewIndex
+#endif //USE_MULTIVIEW
+
+#ifdef USE_MULTIVIEW
+layout(location = 0) out vec3 uv_interp;
+#else
+layout(location = 0) out vec2 uv_interp;
+#endif
+
+layout(push_constant, std430) uniform Params {
+	float max_texel_factor;
+	float res1;
+	float res2;
+	float res3;
+}
+params;
+
+void main() {
+	vec2 base_arr[3] = vec2[](vec2(-1.0, -1.0), vec2(-1.0, 3.0), vec2(3.0, -1.0));
+	gl_Position = vec4(base_arr[gl_VertexIndex], 0.0, 1.0);
+	uv_interp.xy = clamp(gl_Position.xy, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
+#ifdef USE_MULTIVIEW
+	uv_interp.z = ViewIndex;
+#endif
+}
+
+#[fragment]
+
+#version 450
+
+#VERSION_DEFINES
+
+#ifdef USE_MULTIVIEW
+layout(location = 0) in vec3 uv_interp;
+layout(set = 0, binding = 0) uniform sampler2DArray source_color;
+#else /* USE_MULTIVIEW */
+layout(location = 0) in vec2 uv_interp;
+layout(set = 0, binding = 0) uniform sampler2D source_color;
+#endif /* USE_MULTIVIEW */
+
+#ifdef SPLIT_RG
+layout(location = 0) out vec2 frag_color;
+#else
+layout(location = 0) out uint frag_color;
+#endif
+
+layout(push_constant, std430) uniform Params {
+	float max_texel_factor;
+	float res1;
+	float res2;
+	float res3;
+}
+params;
+
+void main() {
+#ifdef USE_MULTIVIEW
+	vec3 uv = uv_interp;
+#else
+	vec2 uv = uv_interp;
+#endif
+
+	// Input is standardized. R for X, G for Y, 0.0 (0) = 1, 0.33 (85) = 2, 0.66 (170) = 3, 1.0 (255) = 8
+	vec4 color = textureLod(source_color, uv, 0.0);
+
+#ifdef SPLIT_RG
+	// Density map for VRS according to VK_EXT_fragment_density_map, we can use as is.
+	frag_color = max(vec2(1.0f) - color.rg, vec2(1.0f / 255.0f));
+#else
+	// Output image shading rate image for VRS according to VK_KHR_fragment_shading_rate.
+	color.r = clamp(floor(color.r * params.max_texel_factor + 0.1), 0.0, params.max_texel_factor);
+	color.g = clamp(floor(color.g * params.max_texel_factor + 0.1), 0.0, params.max_texel_factor);
+
+	// Note 1x4, 4x1, 1x8, 8x1, 2x8 and 8x2 are not supported:
+	if (color.r < (color.g - 1.0)) {
+		color.r = color.g - 1.0;
+	}
+	if (color.g < (color.r - 1.0)) {
+		color.g = color.r - 1.0;
+	}
+
+	// Encode to frag_color;
+	frag_color = int(color.r + 0.1) << 2;
+	frag_color += int(color.g + 0.1);
+#endif
+}