From 05dc633a8c35221ce8d6abe6ddf027f8b0bab6c2 Mon Sep 17 00:00:00 2001
From: tfarley <tfarleygithub@gmail.com>
Date: Mon, 18 May 2015 21:21:33 -0700
Subject: OpenGL renderer

---
 .../renderer_opengl/gl_rasterizer_cache.cpp        | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 src/video_core/renderer_opengl/gl_rasterizer_cache.cpp

(limited to 'src/video_core/renderer_opengl/gl_rasterizer_cache.cpp')

diff --git a/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
new file mode 100644
index 00000000..6f88a8b2
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
@@ -0,0 +1,77 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/make_unique.h"
+#include "common/math_util.h"
+
+#include "core/memory.h"
+
+#include "video_core/renderer_opengl/gl_rasterizer_cache.h"
+#include "video_core/renderer_opengl/pica_to_gl.h"
+#include "video_core/debug_utils/debug_utils.h"
+#include "video_core/math.h"
+
+RasterizerCacheOpenGL::~RasterizerCacheOpenGL() {
+    FullFlush();
+}
+
+void RasterizerCacheOpenGL::LoadAndBindTexture(OpenGLState &state, unsigned texture_unit, const Pica::Regs::FullTextureConfig& config) {
+    PAddr texture_addr = config.config.GetPhysicalAddress();
+
+    const auto cached_texture = texture_cache.find(texture_addr);
+
+    if (cached_texture != texture_cache.end()) {
+        state.texture_units[texture_unit].texture_2d = cached_texture->second->texture.handle;
+        state.Apply();
+    } else {
+        std::unique_ptr<CachedTexture> new_texture = Common::make_unique<CachedTexture>();
+
+        new_texture->texture.Create();
+        state.texture_units[texture_unit].texture_2d = new_texture->texture.handle;
+        state.Apply();
+
+        // TODO: Need to choose filters that correspond to PICA once register is declared
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, PicaToGL::WrapMode(config.config.wrap_s));
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, PicaToGL::WrapMode(config.config.wrap_t));
+
+        const auto info = Pica::DebugUtils::TextureInfo::FromPicaRegister(config.config, config.format);
+
+        new_texture->width = info.width;
+        new_texture->height = info.height;
+        new_texture->size = info.width * info.height * Pica::Regs::NibblesPerPixel(info.format);
+
+        u8* texture_src_data = Memory::GetPhysicalPointer(texture_addr);
+        std::unique_ptr<Math::Vec4<u8>[]> temp_texture_buffer_rgba(new Math::Vec4<u8>[info.width * info.height]);
+
+        for (int y = 0; y < info.height; ++y) {
+            for (int x = 0; x < info.width; ++x) {
+                temp_texture_buffer_rgba[x + info.width * y] = Pica::DebugUtils::LookupTexture(texture_src_data, x, info.height - 1 - y, info);
+            }
+        }
+
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, info.width, info.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, temp_texture_buffer_rgba.get());
+
+        texture_cache.emplace(texture_addr, std::move(new_texture));
+    }
+}
+
+void RasterizerCacheOpenGL::NotifyFlush(PAddr addr, u32 size) {
+    // Flush any texture that falls in the flushed region
+    // TODO: Optimize by also inserting upper bound (addr + size) of each texture into the same map and also narrow using lower_bound
+    auto cache_upper_bound = texture_cache.upper_bound(addr + size);
+    for (auto it = texture_cache.begin(); it != cache_upper_bound;) {
+        if (MathUtil::IntervalsIntersect(addr, size, it->first, it->second->size)) {
+            it = texture_cache.erase(it);
+        } else {
+            ++it;
+        }
+    }
+}
+
+void RasterizerCacheOpenGL::FullFlush() {
+    texture_cache.clear();
+}
-- 
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