maxwell_3d: Use correct const buffer size and check bounds.

- Fixes mem corruption with Super Mario Odyssey and Pokkén Tournament DX.

src/video_core/engines/maxwell_3d.cpp

@@ -238,6 +238,8 @@ void Maxwell3D::ProcessCBBind(Regs::ShaderStage stage) {
 
     auto& buffer = shader.const_buffers[bind_data.index];
 
+    ASSERT(bind_data.index < Regs::MaxConstBuffers);
+
     buffer.enabled = bind_data.valid.Value() != 0;
     buffer.index = bind_data.index;
     buffer.address = regs.const_buffer.BufferAddress();

src/video_core/engines/maxwell_3d.h

@@ -44,7 +44,7 @@ public:
         static constexpr size_t MaxShaderProgram = 6;
         static constexpr size_t MaxShaderStage = 5;
         // Maximum number of const buffers per shader stage.
-        static constexpr size_t MaxConstBuffers = 16;
+        static constexpr size_t MaxConstBuffers = 18;
 
         enum class QueryMode : u32 {
             Write = 0,

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -659,7 +659,10 @@ u32 RasterizerOpenGL::SetupConstBuffers(Maxwell::ShaderStage stage, GLuint progr
         auto& buffer_draw_state =
             state.draw.const_buffers[static_cast<size_t>(stage)][used_buffer.GetIndex()];
 
-        ASSERT_MSG(buffer.enabled, "Attempted to upload disabled constbuffer");
+        if (!buffer.enabled) {
+            continue;
+        }
+
         buffer_draw_state.enabled = true;
         buffer_draw_state.bindpoint = current_bindpoint + bindpoint;
 

src/video_core/renderer_opengl/gl_state.h

@@ -7,6 +7,10 @@
 #include <array>
 #include <glad/glad.h>
 
+#include "video_core/engines/maxwell_3d.h"
+
+using Regs = Tegra::Engines::Maxwell3D::Regs;
+
 namespace TextureUnits {
 
 struct TextureUnit {
@@ -120,7 +124,7 @@ public:
             GLuint bindpoint;
             GLuint ssbo;
         };
-        std::array<std::array<ConstBufferConfig, 16>, 5> const_buffers{};
+        std::array<std::array<ConstBufferConfig, Regs::MaxConstBuffers>, 5> const_buffers;
     } draw;
 
     struct {