fix background color (#460)

* fix background color

* reduce print about false problem

* Update memory.c

assets/shaders/directx/default.shader.hlsl

@@ -300,7 +300,14 @@ float4 PSMain(PSInput input, float4 screenSpace : SV_Position) : SV_TARGET {
     @end
 
     @if(o_grayscale)
-        float intensity = (texel.r + texel.g + texel.b) / 3.0;
+        float p = float(0x19);
+        float r = texel.r*float(0x55);
+        float g = texel.g*float(0x4B);
+        float b = texel.b*float(0x5F);
+        float intensity = (r+g+b) / 256.0;
+        intensity *= 255.0/256.0;
+        intensity = pow(intensity, (p * 1.5 / 256.0) + 0.25);
+        intensity *= 31.0/32.0;
         float3 new_texel = input.grayscale.rgb * intensity;
         texel.rgb = lerp(texel.rgb, new_texel, input.grayscale.a);
     @end

assets/shaders/metal/default.shader.metal

@@ -260,7 +260,14 @@ fragment float4 fragmentShader(ProjectedVertex in [[stage_in]], constant FrameUn
     @end
 
     @if(o_grayscale)
-        float intensity = (texel.x + texel.y + texel.z) / 3.0;
+        float p = float(0x19);
+        float r = texel.r*float(0x55);
+        float g = texel.g*float(0x4B);
+        float b = texel.b*float(0x5F);
+        float intensity = (r+g+b) / 256.0;
+        intensity *= 255.0/256.0;
+        intensity = pow(intensity, (p * 1.5 / 256.0) + 0.25);
+        intensity *= 31.0/32.0;
         float3 new_texel = in.grayscale.xyz * intensity;
         texel.xyz = mix(texel.xyz, new_texel, in.grayscale.w);
     @end

assets/shaders/opengl/default.shader.fs

@@ -188,7 +188,14 @@ void main() {
     @end
 
     @if(o_grayscale)
-        float intensity = (texel.r + texel.g + texel.b) / 3.0;
+        float p = float(0x19);
+        float r = texel.r*float(0x55);
+        float g = texel.g*float(0x4B);
+        float b = texel.b*float(0x5F);
+        float intensity = (r+g+b) / 256.0;
+        intensity *= 255.0/256.0;
+        intensity = pow(intensity, (p * 1.5 / 256.0) + 0.25);
+        intensity *= 31.0/32.0;
         vec3 new_texel = vGrayscaleColor.rgb * intensity;
         texel.rgb = mix(texel.rgb, new_texel, vGrayscaleColor.a);
     @end

src/racing/memory.c

@@ -155,7 +155,7 @@ Gfx* segmented_gfx_to_virtual(const void* addr) {
 }
 
 static uintptr_t get_texture2(size_t offset, const course_texture* textures) {
-    if (!(offset & 0x5000000)) {
+    if (!((offset >= 0x5000000) && (offset < 0x6000000))) {
         return NULL;
     }
     size_t totalOffset = 0x5000000;