From 7a35f9285b354c8fd24295e11bcb85a2b99b3de5 Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Tue, 1 Sep 2015 05:23:43 -0500
Subject: [GLES] Support texture_buffer for palette texture conversion.

OpenGL ES 3.2 adds this feature to core
It was available to GLES 3.1 as GL_{EXT, OES}_texture_buffer as well.
For the non-Nvidia vendors that implemented this is:
      - Qualcomm's Adreno 4xx
      - IMGTec's PowerVR Rogue
---
 Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

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

diff --git a/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp b/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
index 22e86cfe42..8b60fe069e 100644
--- a/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
+++ b/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
@@ -524,6 +524,7 @@ void ProgramShaderCache::CreateHeader()
 	GLSL_VERSION v = g_ogl_config.eSupportedGLSLVersion;
 	bool is_glsles = v >= GLSLES_300;
 	std::string SupportedESPointSize;
+	std::string SupportedESTextureBuffer;
 	switch (g_ogl_config.SupportedESPointSize)
 	{
 	case 1: SupportedESPointSize = "#extension GL_OES_geometry_point_size : enable"; break;
@@ -531,6 +532,20 @@ void ProgramShaderCache::CreateHeader()
 	default: SupportedESPointSize = ""; break;
 	}
 
+	switch (g_ogl_config.SupportedESTextureBuffer)
+	{
+	case ES_TEXBUF_TYPE::TEXBUF_EXT:
+		SupportedESTextureBuffer = "#extension GL_EXT_texture_buffer : enable";
+	break;
+	case ES_TEXBUF_TYPE::TEXBUF_OES:
+		SupportedESTextureBuffer = "#extension GL_OES_texture_buffer : enable";
+	break;
+	case ES_TEXBUF_TYPE::TEXBUF_CORE:
+	case ES_TEXBUF_TYPE::TEXBUF_NONE:
+		SupportedESTextureBuffer = "";
+	break;
+	}
+
 	snprintf(s_glsl_header, sizeof(s_glsl_header),
 		"%s\n"
 		"%s\n" // ubo
@@ -544,11 +559,13 @@ void ProgramShaderCache::CreateHeader()
 		"%s\n" // Geometry point size
 		"%s\n" // AEP
 		"%s\n" // texture buffer
+		"%s\n" // ES texture buffer
 
 		// Precision defines for GLSL ES
 		"%s\n"
 		"%s\n"
 		"%s\n"
+		"%s\n"
 
 		// Silly differences
 		"#define float2 vec2\n"
@@ -581,10 +598,12 @@ void ProgramShaderCache::CreateHeader()
 		, SupportedESPointSize.c_str()
 		, g_ogl_config.bSupportsAEP ? "#extension GL_ANDROID_extension_pack_es31a : enable" : ""
 		, v<GLSL_140 && g_ActiveConfig.backend_info.bSupportsPaletteConversion ? "#extension GL_ARB_texture_buffer_object : enable" : ""
+		, SupportedESTextureBuffer.c_str()
 
 		, is_glsles ? "precision highp float;" : ""
 		, is_glsles ? "precision highp int;" : ""
 		, is_glsles ? "precision highp sampler2DArray;" : ""
+		, (is_glsles && g_ActiveConfig.backend_info.bSupportsPaletteConversion) ? "precision highp usamplerBuffer;" : ""
 
 		, DriverDetails::HasBug(DriverDetails::BUG_BROKENTEXTURESIZE) ? "#define textureSize(x, y) ivec2(1, 1)" : ""
 		, DriverDetails::HasBug(DriverDetails::BUG_BROKENCENTROID) ? "#define centroid" : ""
-- 
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