From d8cd2c3252ab6f2ce6c1656b5eb194863e834f52 Mon Sep 17 00:00:00 2001
From: Rodolfo Bogado <rodolfoosvaldobogado@gmail.com>
Date: Mon, 29 Jun 2015 22:19:19 -0300
Subject: Implement scaled partial texture updates

---
 Source/Core/VideoBackends/OGL/TextureCache.cpp | 69 +++++++++++++++++++++++---
 1 file changed, 62 insertions(+), 7 deletions(-)

(limited to 'Source/Core/VideoBackends/OGL/TextureCache.cpp')

diff --git a/Source/Core/VideoBackends/OGL/TextureCache.cpp b/Source/Core/VideoBackends/OGL/TextureCache.cpp
index cefc8017d6..ebc3a672f1 100644
--- a/Source/Core/VideoBackends/OGL/TextureCache.cpp
+++ b/Source/Core/VideoBackends/OGL/TextureCache.cpp
@@ -33,11 +33,13 @@
 namespace OGL
 {
 
+static SHADER s_ColorCopyProgram;
 static SHADER s_ColorMatrixProgram;
 static SHADER s_DepthMatrixProgram;
 static GLuint s_ColorMatrixUniform;
 static GLuint s_DepthMatrixUniform;
 static GLuint s_ColorCopyPositionUniform;
+static GLuint s_ColorMatrixPositionUniform;
 static GLuint s_DepthCopyPositionUniform;
 static u32 s_ColorCbufid;
 static u32 s_DepthCbufid;
@@ -137,12 +139,53 @@ TextureCache::TCacheEntryBase* TextureCache::CreateTexture(const TCacheEntryConf
 	return entry;
 }
 
-void TextureCache::TCacheEntry::DoPartialTextureUpdate(TCacheEntryBase* entry_, u32 x, u32 y)
+void TextureCache::TCacheEntry::CopyRectangleFromTexture(
+	const TCacheEntryBase* source,
+	const MathUtil::Rectangle<int> &srcrect,
+	const MathUtil::Rectangle<int> &dstrect)
 {
-
-	TCacheEntry* entry = (TCacheEntry*)entry_;
-
-	glCopyImageSubData(entry->texture, GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, texture, GL_TEXTURE_2D_ARRAY, 0, x, y, 0, entry->native_width, entry->native_height, 1);
+	TCacheEntry* srcentry = (TCacheEntry*)source;
+	if (srcrect.GetWidth() == dstrect.GetWidth()
+		&& srcrect.GetHeight() == dstrect.GetHeight()
+		&& g_ActiveConfig.backend_info.bSupportsCopySubImage)
+	{
+		glCopyImageSubData(
+			srcentry->texture,
+			GL_TEXTURE_2D_ARRAY,
+			0,
+			srcrect.left,
+			srcrect.top,
+			0,
+			texture,
+			GL_TEXTURE_2D_ARRAY,
+			0,
+			dstrect.left,
+			dstrect.top,
+			0,
+			dstrect.GetWidth(),
+			dstrect.GetHeight(),
+			1);
+		return;
+	}
+	else if (!config.rendertarget)
+	{
+		return;
+	}
+	g_renderer->ResetAPIState();
+	FramebufferManager::SetFramebuffer(framebuffer);
+	glActiveTexture(GL_TEXTURE9);
+	glBindTexture(GL_TEXTURE_2D_ARRAY, srcentry->texture);
+	g_sampler_cache->BindLinearSampler(9);
+	glViewport(dstrect.left, dstrect.top, dstrect.GetWidth(), dstrect.GetHeight());
+	s_ColorCopyProgram.Bind();
+	glUniform4f(s_ColorCopyPositionUniform,
+		float(srcrect.left),
+		float(srcrect.top),
+		float(srcrect.GetWidth()),
+		float(srcrect.GetHeight()));
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+	FramebufferManager::SetFramebuffer(0);
+	g_renderer->RestoreAPIState();
 }
 
 void TextureCache::TCacheEntry::Load(unsigned int width, unsigned int height,
@@ -208,7 +251,7 @@ void TextureCache::TCacheEntry::FromRenderTarget(u32 dstAddr, unsigned int dstFo
 		if (s_ColorCbufid != cbufid)
 			glUniform4fv(s_ColorMatrixUniform, 7, colmat);
 		s_ColorCbufid = cbufid;
-		uniform_location = s_ColorCopyPositionUniform;
+		uniform_location = s_ColorMatrixPositionUniform;
 	}
 
 	TargetRectangle R = g_renderer->ConvertEFBRectangle(srcRect);
@@ -286,6 +329,16 @@ void TextureCache::SetStage()
 
 void TextureCache::CompileShaders()
 {
+	const char *pColorCopyProg =
+		"SAMPLER_BINDING(9) uniform sampler2DArray samp9;\n"
+		"in vec3 f_uv0;\n"
+		"out vec4 ocol0;\n"
+		"\n"
+		"void main(){\n"
+		"	vec4 texcol = texture(samp9, f_uv0);\n"
+		"	ocol0 = texcol;\n"
+		"}\n";
+
 	const char *pColorMatrixProg =
 		"SAMPLER_BINDING(9) uniform sampler2DArray samp9;\n"
 		"uniform vec4 colmat[7];\n"
@@ -357,6 +410,7 @@ void TextureCache::CompileShaders()
 	const char* prefix = (GProgram == nullptr) ? "f" : "v";
 	const char* depth_layer = (g_ActiveConfig.bStereoEFBMonoDepth) ? "0.0" : "f_uv0.z";
 
+	ProgramShaderCache::CompileShader(s_ColorCopyProgram, StringFromFormat(VProgram, prefix, prefix).c_str(), pColorCopyProg, GProgram);
 	ProgramShaderCache::CompileShader(s_ColorMatrixProgram, StringFromFormat(VProgram, prefix, prefix).c_str(), pColorMatrixProg, GProgram);
 	ProgramShaderCache::CompileShader(s_DepthMatrixProgram, StringFromFormat(VProgram, prefix, prefix).c_str(), StringFromFormat(pDepthMatrixProg, depth_layer).c_str(), GProgram);
 
@@ -365,7 +419,8 @@ void TextureCache::CompileShaders()
 	s_ColorCbufid = -1;
 	s_DepthCbufid = -1;
 
-	s_ColorCopyPositionUniform = glGetUniformLocation(s_ColorMatrixProgram.glprogid, "copy_position");
+	s_ColorCopyPositionUniform = glGetUniformLocation(s_ColorCopyProgram.glprogid, "copy_position");
+	s_ColorMatrixPositionUniform = glGetUniformLocation(s_ColorMatrixProgram.glprogid, "copy_position");
 	s_DepthCopyPositionUniform = glGetUniformLocation(s_DepthMatrixProgram.glprogid, "copy_position");
 
 	std::string palette_shader =
-- 
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