Mark everything in shaders as highp, switch to ES context

Author: janisozaur

Data/Base.rte/Shaders/Blit8.frag

@@ -1,12 +1,15 @@
 // Blit8.frag
-#version 330 core
+#version 300 es
 
-in vec2 textureUV;
+precision highp float;
+precision highp sampler2D;
 
-out vec4 FragColor;
+in highp vec2 textureUV;
 
-uniform sampler2D rteTexture;
-uniform sampler2D rtePalette;
+out highp vec4 FragColor;
+
+uniform highp sampler2D rteTexture;
+uniform highp sampler2D rtePalette;
 
 void main() {
 	float colorIndex = texture(rteTexture, vec2(textureUV.x, -textureUV.y)).r;

Data/Base.rte/Shaders/Blit8.vert

@@ -1,13 +1,15 @@
-#version 330 core
+#version 300 es
 
-layout(location = 0) in vec2 rteVertexPosition;
-layout(location = 1) in vec2 rteTexUV;
+precision highp float;
 
-out vec2 textureUV;
+layout(location = 0) in highp vec2 rteVertexPosition;
+layout(location = 1) in highp vec2 rteTexUV;
 
-uniform mat4 rteTransform;
-uniform mat4 rteProjection;
-uniform mat4 rteUVTransform;
+out highp vec2 textureUV;
+
+uniform highp mat4 rteTransform;
+uniform highp mat4 rteProjection;
+uniform highp mat4 rteUVTransform;
 
 void main() {
 	gl_Position = rteProjection * rteTransform * vec4(rteVertexPosition, 0.0, 1.0);

Data/Base.rte/Shaders/PostProcess.frag

@@ -1,11 +1,14 @@
-#version 330 core
+#version 300 es
 
-in vec2 textureUV;
+precision highp float;
+precision highp sampler2D;
 
-out vec4 FragColor;
+in highp vec2 textureUV;
 
-uniform sampler2D rteTexture;
-uniform vec4 rteColor;
+out highp vec4 FragColor;
+
+uniform highp sampler2D rteTexture;
+uniform highp vec4 rteColor;
 
 void main() {
 	FragColor = texture(rteTexture, textureUV) * rteColor;

Data/Base.rte/Shaders/PostProcess.vert

@@ -1,12 +1,14 @@
-#version 330 core
+#version 300 es
 
-layout(location = 0) in vec2 rteVertexPosition;
-layout(location = 1) in vec2 rteTexUV;
+precision highp float;
 
-out vec2 textureUV;
+layout(location = 0) in highp vec2 rteVertexPosition;
+layout(location = 1) in highp vec2 rteTexUV;
 
-uniform mat4 rteTransform;
-uniform mat4 rteProjection;
+out highp vec2 textureUV;
+
+uniform highp mat4 rteTransform;
+uniform highp mat4 rteProjection;
 
 void main() {
 	gl_Position = rteProjection * rteTransform * vec4(rteVertexPosition, 0.0, 1.0);

Data/Base.rte/Shaders/ScreenBlit.frag

@@ -1,11 +1,14 @@
-#version 330 core
+#version 300 es
 
-in vec2 textureUV;
+precision highp float;
+precision highp sampler2D;
 
-out vec4 FragColor;
+in highp vec2 textureUV;
 
-uniform sampler2D rteTexture;
-uniform sampler2D rteGUITexture;
+out highp vec4 FragColor;
+
+uniform highp sampler2D rteTexture;
+uniform highp sampler2D rteGUITexture;
 
 vec4 texture2DAA(sampler2D tex, vec2 uv) {
 	vec2 texsize = vec2(textureSize(tex, 0));

Data/Base.rte/Shaders/ScreenBlit.vert

@@ -1,12 +1,14 @@
-#version 330 core
+#version 300 es
 
-layout(location = 0) in vec2 rteVertexPosition;
-layout(location = 1) in vec2 rteTexUV;
+precision highp float;
 
-out vec2 textureUV;
+layout(location = 0) in highp vec2 rteVertexPosition;
+layout(location = 1) in highp vec2 rteTexUV;
 
-uniform mat4 rteTransform;
-uniform mat4 rteProjection;
+out highp vec2 textureUV;
+
+uniform highp mat4 rteTransform;
+uniform highp mat4 rteProjection;
 
 void main() {
 	gl_Position = rteProjection * rteTransform * vec4(rteVertexPosition.xy, 0.0, 1.0);

Source/Managers/WindowMan.cpp

@@ -99,8 +99,8 @@ void WindowMan::Initialize() {
 
 	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
-	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
-	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
 	CreatePrimaryWindow();
 	InitializeOpenGL();
 	CreateBackBufferTexture();