GPU: Various HW renderer fixes

src/pse/gpu.cpp

@@ -513,6 +513,7 @@ void GPU::TextureConfig::SetColorMode(TextureColorMode new_color_mode)
     return;
 
   color_mode = new_color_mode;
+  page_changed = true;
 }
 
 void GPU::TextureConfig::SetFromPolygonTexcoord(u32 texcoord0, u32 texcoord1)
@@ -534,6 +535,7 @@ void GPU::TextureConfig::SetFromPageAttribute(u16 value)
 
   base_x = static_cast<s32>(ZeroExtend32(value & UINT16_C(0x1FF)) * UINT32_C(64));
   base_y = static_cast<s32>(ZeroExtend32((value >> 11) & UINT16_C(1)) * UINT32_C(512));
+  page_attribute = value;
   page_changed = true;
 }
 
@@ -545,4 +547,6 @@ void GPU::TextureConfig::SetFromPaletteAttribute(u16 value)
 
   palette_x = static_cast<s32>(ZeroExtend32(value & UINT16_C(0x3F)) * UINT32_C(16));
   palette_y = static_cast<s32>(ZeroExtend32((value >> 6) & UINT16_C(0x1FF)));
+  palette_attribute = value;
+  page_changed = true;
 }

src/pse/gpu_hw.cpp

@@ -212,10 +212,13 @@ void main()
 {
   #if TEXTURED
     vec4 texcol = texture(samp0, v_tex0);
+    if (all(texcol == vec4(0.0, 0.0, 0.0, 0.0)))
+      discard;
+
     #if BLENDING
       o_col0 = v_col0 * texcol;
     #else
-      o_col0 = /*v_col0 + */texcol;
+      o_col0 = texcol;
     #endif
   #else
     o_col0 = v_col0;
@@ -338,6 +341,7 @@ void GPU_HW::DispatchRenderCommand(RenderCommand rc, u32 num_vertices)
         else
           m_texture_config.SetFromPolygonTexcoord(m_GP0_command[2], m_GP0_command[4]);
       }
+      break;
 
       case Primitive::Rectangle:
       {

src/pse/gpu_hw_opengl.cpp

@@ -185,9 +185,9 @@ inline u32 ConvertRGBA5551ToRGBA8888(u16 color)
   u8 a = Truncate8((color >> 15) & 1);
 
   // 00012345 -> 1234545
-  b = (b << 3) | (b >> 3);
+  b = (b << 3) | (b & 0b111);
-  g = (g << 3) | (g >> 3);
+  g = (g << 3) | (g & 0b111);
-  r = (r << 3) | (r >> 3);
+  r = (r << 3) | (r & 0b111);
   a = a ? 255 : 0;
 
   return ZeroExtend32(r) | (ZeroExtend32(g) << 8) | (ZeroExtend32(b) << 16) | (ZeroExtend32(a) << 24);
@@ -214,7 +214,7 @@ void GPU_HW_OpenGL::ReadVRAM(u32 x, u32 y, u32 width, u32 height, void* buffer)
   // we need to convert RGBA8 -> RGBA5551
   std::vector<u32> temp_buffer(width * height);
   glBindFramebuffer(GL_READ_FRAMEBUFFER, m_framebuffer_fbo_id);
-  glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, temp_buffer.data());
+  glReadPixels(x, VRAM_HEIGHT - y - height, width, height, GL_RGBA, GL_UNSIGNED_BYTE, temp_buffer.data());
 
   // reverse copy because of lower-left origin
   const u32 source_stride = width * sizeof(u32);