Merge pull request #907 from Lectem/clamp_to_border

Add GL_CLAMP_TO_BORDER support.

src/video_core/pica.h

@@ -114,11 +114,17 @@ struct Regs {
     struct TextureConfig {
         enum WrapMode : u32 {
             ClampToEdge    = 0,
+            ClampToBorder  = 1,
             Repeat         = 2,
             MirroredRepeat = 3,
         };
 
-        INSERT_PADDING_WORDS(0x1);
+        union {
+            BitField< 0, 8, u32> r;
+            BitField< 8, 8, u32> g;
+            BitField<16, 8, u32> b;
+            BitField<24, 8, u32> a;
+        } border_color;
 
         union {
             BitField< 0, 16, u32> height;

src/video_core/rasterizer.cpp

@@ -349,6 +349,9 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
                             val = std::min(val, (int)size - 1);
                             return val;
 
+                        case Regs::TextureConfig::ClampToBorder:
+                            return val;
+
                         case Regs::TextureConfig::Repeat:
                             return (int)((unsigned)val % size);
 
@@ -367,6 +370,11 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
                     }
                 };
 
+                if ((texture.config.wrap_s == Regs::TextureConfig::ClampToBorder && (s < 0 || s >= texture.config.width))
+                    || (texture.config.wrap_t == Regs::TextureConfig::ClampToBorder && (t < 0 || t >= texture.config.height))) {
+                    auto border_color = texture.config.border_color;
+                    texture_color[i] = { border_color.r, border_color.g, border_color.b, border_color.a };
+                } else {
                     // Textures are laid out from bottom to top, hence we invert the t coordinate.
                     // NOTE: This may not be the right place for the inversion.
                     // TODO: Check if this applies to ETC textures, too.
@@ -379,6 +387,7 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
                     texture_color[i] = DebugUtils::LookupTexture(texture_data, s, t, info);
                     DebugUtils::DumpTexture(texture.config, texture_data);
                 }
+            }
 
             // Texture environment - consists of 6 stages of color and alpha combining.
             //

src/video_core/renderer_opengl/pica_to_gl.h

@@ -15,7 +15,7 @@ namespace PicaToGL {
 inline GLenum WrapMode(Pica::Regs::TextureConfig::WrapMode mode) {
     static const GLenum wrap_mode_table[] = {
         GL_CLAMP_TO_EDGE,  // WrapMode::ClampToEdge
-        0,                 // Unknown
+        GL_CLAMP_TO_BORDER,// WrapMode::ClampToBorder
         GL_REPEAT,         // WrapMode::Repeat
         GL_MIRRORED_REPEAT // WrapMode::MirroredRepeat
     };