Revert to using GL compatibility contexts (and GLES2)

shader/bitmapBlit.frag

@@ -8,27 +8,26 @@ uniform vec4 subRect;
 
 uniform lowp float opacity;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
-out vec4 fragColor;
+void main()
+{
+	vec2 coor = v_texCoord;
+	vec2 dstCoor = (coor - subRect.xy) * subRect.zw;
 
-void main() {
-  vec2 coor = v_texCoord;
-  vec2 dstCoor = (coor - subRect.xy) * subRect.zw;
+	vec4 srcFrag = texture2D(source, coor);
+	vec4 dstFrag = texture2D(destination, dstCoor);
 
-  vec4 srcFrag = texture(source, coor);
-  vec4 dstFrag = texture(destination, dstCoor);
+	vec4 resFrag;
 
-  vec4 resFrag;
+	float co1 = srcFrag.a * opacity;
+	float co2 = dstFrag.a * (1.0 - co1);
+	resFrag.a = co1 + co2;
 
-  float co1 = srcFrag.a * opacity;
-  float co2 = dstFrag.a * (1.0 - co1);
-  resFrag.a = co1 + co2;
+	if (resFrag.a == 0.0)
+		resFrag.rgb = srcFrag.rgb;
+	else
+		resFrag.rgb = (co1*srcFrag.rgb + co2*dstFrag.rgb) / resFrag.a;
 
-  if (resFrag.a == 0.0)
-    resFrag.rgb = srcFrag.rgb;
-  else
-    resFrag.rgb = (co1 * srcFrag.rgb + co2 * dstFrag.rgb) / resFrag.a;
-
-  fragColor = resFrag;
+	gl_FragColor = resFrag;
 }

shader/blur.frag

@@ -1,17 +1,16 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 
-in vec2 v_texCoord;
-in vec2 v_blurCoord[2];
+varying vec2 v_texCoord;
+varying vec2 v_blurCoord[2];
 
-out vec4 fragColor;
+void main()
+{
+	lowp vec4 frag = vec4(0, 0, 0, 0);
 
-void main() {
-  lowp vec4 frag = vec4(0, 0, 0, 0);
+	frag += texture2D(texture, v_texCoord);
+	frag += texture2D(texture, v_blurCoord[0]);
+	frag += texture2D(texture, v_blurCoord[1]);
 
-  frag += texture(v_texture, v_texCoord);
-  frag += texture(v_texture, v_blurCoord[0]);
-  frag += texture(v_texture, v_blurCoord[1]);
-
-  fragColor = frag / 3.0;
+	gl_FragColor = frag / 3.0;
 }

shader/common.h

@@ -1,8 +1,15 @@
-#version 330
-#define attribute in
-#define varying out
+#ifdef GLSLES
+
+#ifdef FRAGMENT_SHADER
+/* Only the fragment shader has no default float precision */
+precision mediump float;
+#endif
+
+#else
 
 /* Desktop GLSL doesn't know about these */
 #define highp
 #define mediump
 #define lowp
+
+#endif

shader/flashMap.frag

@@ -1,7 +1,9 @@
 
 uniform lowp float alpha;
 
-in lowp vec4 v_color;
+varying lowp vec4 v_color;
 
-out vec4 fragColor;
-void main() { fragColor = vec4(v_color.rgb * alpha, 1); }
+void main()
+{
+	gl_FragColor = vec4(v_color.rgb * alpha, 1);
+}

shader/flatColor.frag

@@ -1,4 +1,7 @@
 
 uniform lowp vec4 color;
-out vec4 fragColor;
-void main() { fragColor = color; }
+
+void main()
+{
+	gl_FragColor = color;
+}

shader/gray.frag

@@ -1,19 +1,19 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 uniform lowp float gray;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
 const vec3 lumaF = vec3(.299, .587, .114);
 
-out vec4 fragColor;
-void main() {
-  /* Sample source color */
-  vec4 frag = texture(v_texture, v_texCoord);
+void main()
+{
+	/* Sample source color */
+	vec4 frag = texture2D(texture, v_texCoord);
 
-  /* Apply gray */
-  float luma = dot(frag.rgb, lumaF);
-  frag.rgb = mix(frag.rgb, vec3(luma), gray);
+	/* Apply gray */
+	float luma = dot(frag.rgb, lumaF);
+	frag.rgb = mix(frag.rgb, vec3(luma), gray);
 
-  fragColor = frag;
+	gl_FragColor = frag;
 }

shader/hue.frag

@@ -1,39 +1,40 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 uniform mediump float hueAdjust;
 
-in vec2 v_texCoord;
-
-out vec4 fragColor;
+varying vec2 v_texCoord;
 
 /* Source: gamedev.stackexchange.com/a/59808/24839 */
-vec3 rgb2hsv(vec3 c) {
-  const vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
-  vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
-  vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
+vec3 rgb2hsv(vec3 c)
+{
+	const vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+	vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
+	vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
 
-  float d = q.x - min(q.w, q.y);
+	float d = q.x - min(q.w, q.y);
 
-  /* Avoid divide-by-zero situations by adding a very tiny delta.
-   * Since we always deal with underlying 8-Bit color values, this
-   * should never mask a real value */
-  const float eps = 1.0e-10;
+	/* Avoid divide-by-zero situations by adding a very tiny delta.
+	 * Since we always deal with underlying 8-Bit color values, this
+	 * should never mask a real value */
+	const float eps = 1.0e-10;
 
-  return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + eps)), d / (q.x + eps), q.x);
+	return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + eps)), d / (q.x + eps), q.x);
 }
 
-vec3 hsv2rgb(vec3 c) {
-  const vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
-  vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
-  return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
+vec3 hsv2rgb(vec3 c)
+{
+	const vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+	vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
+	return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
 }
 
-void main() {
-  vec4 color = texture(v_texture, v_texCoord.xy);
-  vec3 hsv = rgb2hsv(color.rgb);
+void main ()
+{
+	vec4 color = texture2D (texture, v_texCoord.xy);
+	vec3 hsv = rgb2hsv(color.rgb);
 
-  hsv.x += hueAdjust;
-  color.rgb = hsv2rgb(hsv);
+	hsv.x += hueAdjust;
+	color.rgb = hsv2rgb(hsv);
 
-  fragColor = color;
+	gl_FragColor = color;
 }

shader/minimal.vert

@@ -2,4 +2,7 @@
 uniform mat4 projMat;
 attribute vec2 position;
 
-void main() { gl_Position = projMat * vec4(position, 0, 1); }
+void main()
+{
+	gl_Position = projMat * vec4(position, 0, 1);
+}

shader/plane.frag

@@ -1,5 +1,5 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 
 uniform lowp vec4 tone;
 
@@ -7,31 +7,30 @@ uniform lowp float opacity;
 uniform lowp vec4 color;
 uniform lowp vec4 flash;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
 const vec3 lumaF = vec3(.299, .587, .114);
 
-out vec4 fragColor;
+void main()
+{
+	/* Sample source color */
+	vec4 frag = texture2D(texture, v_texCoord);
+	
+	/* Apply gray */
+	float luma = dot(frag.rgb, lumaF);
+	frag.rgb = mix(frag.rgb, vec3(luma), tone.w);
+	
+	/* Apply tone */
+	frag.rgb += tone.rgb;
 
-void main() {
-  /* Sample source color */
-  vec4 frag = texture(v_texture, v_texCoord);
+	/* Apply opacity */
+	frag.a *= opacity;
+	
+	/* Apply color */
+	frag.rgb = mix(frag.rgb, color.rgb, color.a);
 
-  /* Apply gray */
-  float luma = dot(frag.rgb, lumaF);
-  frag.rgb = mix(frag.rgb, vec3(luma), tone.w);
-
-  /* Apply tone */
-  frag.rgb += tone.rgb;
-
-  /* Apply opacity */
-  frag.a *= opacity;
-
-  /* Apply color */
-  frag.rgb = mix(frag.rgb, color.rgb, color.a);
-
-  /* Apply flash */
-  frag.rgb = mix(frag.rgb, flash.rgb, flash.a);
-
-  fragColor = frag;
+	/* Apply flash */
+	frag.rgb = mix(frag.rgb, flash.rgb, flash.a);
+	
+	gl_FragColor = frag;
 }

shader/simple.frag

@@ -1,7 +1,9 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
-out vec4 fragColor;
-void main() { fragColor = texture(v_texture, v_texCoord); }
+void main()
+{
+	gl_FragColor = texture2D(texture, v_texCoord);
+}

shader/simpleAlpha.frag

@@ -1,11 +1,11 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 
-in vec2 v_texCoord;
-in lowp vec4 v_color;
+varying vec2 v_texCoord;
+varying lowp vec4 v_color;
 
-out vec4 fragColor;
-void main() {
-  fragColor = texture(v_texture, v_texCoord);
-  fragColor.a *= v_color.a;
+void main()
+{
+	gl_FragColor = texture2D(texture, v_texCoord);
+	gl_FragColor.a *= v_color.a;
 }

shader/simpleAlphaUni.frag

@@ -1,11 +1,11 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 uniform lowp float alpha;
 
-in vec2 v_texCoord;
-out vec4 fragColor;
+varying vec2 v_texCoord;
 
-void main() {
-  fragColor = texture(v_texture, v_texCoord);
-  fragColor.a *= alpha;
+void main()
+{
+	gl_FragColor = texture2D(texture, v_texCoord);
+	gl_FragColor.a *= alpha;
 }

shader/simpleColor.frag

@@ -1,4 +1,7 @@
 
-in lowp vec4 v_color;
-out vec4 fragColor;
-void main() { fragColor = v_color; }
+varying lowp vec4 v_color;
+
+void main()
+{
+	gl_FragColor = v_color;
+}

shader/sprite.frag

@@ -1,5 +1,5 @@
 
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 
 uniform lowp vec4 tone;
 
@@ -9,32 +9,31 @@ uniform lowp vec4 color;
 uniform float bushDepth;
 uniform lowp float bushOpacity;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
 const vec3 lumaF = vec3(.299, .587, .114);
 
-out vec4 fragColor;
+void main()
+{
+	/* Sample source color */
+	vec4 frag = texture2D(texture, v_texCoord);
+	
+	/* Apply gray */
+	float luma = dot(frag.rgb, lumaF);
+	frag.rgb = mix(frag.rgb, vec3(luma), tone.w);
+	
+	/* Apply tone */
+	frag.rgb += tone.rgb;
 
-void main() {
-  /* Sample source color */
-  vec4 frag = texture(v_texture, v_texCoord);
+	/* Apply opacity */
+	frag.a *= opacity;
+	
+	/* Apply color */
+	frag.rgb = mix(frag.rgb, color.rgb, color.a);
 
-  /* Apply gray */
-  float luma = dot(frag.rgb, lumaF);
-  frag.rgb = mix(frag.rgb, vec3(luma), tone.w);
-
-  /* Apply tone */
-  frag.rgb += tone.rgb;
-
-  /* Apply opacity */
-  frag.a *= opacity;
-
-  /* Apply color */
-  frag.rgb = mix(frag.rgb, color.rgb, color.a);
-
-  /* Apply bush alpha by mathematical if */
-  lowp float underBush = float(v_texCoord.y < bushDepth);
-  frag.a *= clamp(bushOpacity + underBush, 0.0, 1.0);
-
-  fragColor = frag;
+	/* Apply bush alpha by mathematical if */
+	lowp float underBush = float(v_texCoord.y < bushDepth);
+	frag.a *= clamp(bushOpacity + underBush, 0.0, 1.0);
+	
+	gl_FragColor = frag;
 }

shader/tilemap.frag

@@ -1,20 +1,17 @@
-
-uniform sampler2D v_texture;
+uniform sampler2D texture;
 
 uniform lowp vec4 tone;
 
 uniform lowp float opacity;
 uniform lowp vec4 color;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
 const vec3 lumaF = vec3(.299, .587, .114);
 
-out vec4 fragColor;
-
 void main() {
   /* Sample source color */
-  vec4 frag = texture(v_texture, v_texCoord);
+  vec4 frag = texture2D(texture, v_texCoord);
 
   /* Apply gray */
   float luma = dot(frag.rgb, lumaF);
@@ -29,5 +26,5 @@ void main() {
   /* Apply color */
   frag.rgb = mix(frag.rgb, color.rgb, color.a);
 
-  fragColor = frag;
-}
+  gl_FragColor = frag;
+}

shader/tilemap.vert

@@ -1,4 +1,3 @@
-
 uniform mat4 projMat;
 
 uniform vec2 texSizeInv;
@@ -17,7 +16,7 @@ const float tileH = 32.0;
 const float autotileW = 3.0*tileW;
 const float autotileH = 4.0*tileW;
 const float atAreaW = autotileW;
-const float atAreaH = autotileH*nAutotiles;
+const float atAreaH = autotileH*float(nAutotiles);
 const float atAniOffsetX = 3.0*tileW;
 const float atAniOffsetY = tileH;
 
@@ -25,17 +24,17 @@ uniform lowp int atFrames[nAutotiles];
 
 void main()
 {
-	vec2 tex = texCoord;
-	lowp uint atIndex = uint(tex.y / autotileH);
+    vec2 tex = texCoord;
+    lowp int atIndex = int(tex.y / autotileH);
 
-	lowp uint pred = uint(tex.x <= atAreaW && tex.y <= atAreaH);
-	lowp uint frame = uint(aniIndex % atFrames[atIndex]);
-	lowp uint col = frame % 8u;
-	lowp uint row = frame / 8u;
-	tex.x += atAniOffsetX * (col * pred);
-	tex.y += atAniOffsetY * (row * pred);
+    lowp int pred = int(tex.x <= atAreaW && tex.y <= atAreaH);
+    lowp int frame = int(aniIndex - atFrames[atIndex] * (aniIndex / atFrames[atIndex]));
+    lowp int row = frame / 8;
+    lowp int col = frame - 8 * row;
+    tex.x += atAniOffsetX * float(col * pred);
+    tex.y += atAniOffsetY * float(row * pred);
 
-	gl_Position = projMat * vec4(position + translation, 0, 1);
+    gl_Position = projMat * vec4(position + translation, 0, 1);
 
-	v_texCoord = tex * texSizeInv;
+    v_texCoord = tex * texSizeInv;
 }

shader/trans.frag

@@ -8,17 +8,16 @@ uniform float prog;
 /* Vague [0, 512] normalized */
 uniform float vague;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
-out vec4 fragColor;
-
-void main() {
-  float transV = texture(transMap, v_texCoord).r;
-  float cTransV = clamp(transV, prog, prog + vague);
-  lowp float alpha = (cTransV - prog) / vague;
-
-  vec4 newFrag = texture(currentScene, v_texCoord);
-  vec4 oldFrag = texture(frozenScene, v_texCoord);
-
-  fragColor = mix(newFrag, oldFrag, alpha);
+void main()
+{
+    float transV = texture2D(transMap, v_texCoord).r;
+    float cTransV = clamp(transV, prog, prog+vague);
+    lowp float alpha = (cTransV - prog) / vague;
+    
+    vec4 newFrag = texture2D(currentScene, v_texCoord);
+    vec4 oldFrag = texture2D(frozenScene, v_texCoord);
+    
+    gl_FragColor = mix(newFrag, oldFrag, alpha);
 }

shader/transSimple.frag

@@ -5,13 +5,12 @@ uniform sampler2D frozenScene;
 uniform sampler2D currentScene;
 uniform float prog;
 
-in vec2 v_texCoord;
+varying vec2 v_texCoord;
 
-out vec4 fragColor;
+void main()
+{
+    vec4 newPixel = texture2D(currentScene, v_texCoord);
+    vec4 oldPixel = texture2D(frozenScene, v_texCoord);
 
-void main() {
-  vec4 newPixel = texture(currentScene, v_texCoord);
-  vec4 oldPixel = texture(frozenScene, v_texCoord);
-
-  fragColor = mix(oldPixel, newPixel, prog);
+    gl_FragColor = mix(oldPixel, newPixel, prog);
 }

src/config.h

@@ -29,11 +29,6 @@
 struct Config {
   int rgssVersion;
 
-  struct {
-    char major;
-    char minor;
-  } glVersion;
-
   bool debugMode;
   bool printFPS;
 

src/config.mm

@@ -170,14 +170,6 @@ void Config::read(int argc, char *argv[]) {
   fillStringVec(opts[@"rubyLoadpath"], rubyLoadpaths);
   rgssVersion = clamp(rgssVersion, 0, 3);
   SE.sourceCount = clamp(SE.sourceCount, 1, 64);
-
-  if ([opts[@"openGL4"] boolValue]) {
-    glVersion.major = 4;
-    glVersion.minor = 1;
-  } else {
-    glVersion.major = 3;
-    glVersion.minor = 3;
-  }
 }
 
 static void setupScreenSize(Config &conf) {

src/main.mm

@@ -448,13 +448,6 @@ static SDL_GLContext initGL(SDL_Window *win, Config &conf,
   if (conf.debugMode)
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
 
-  // Core profile enables OpenGL4 on macOS
-  // Using OpenGL 4.1 requires a GPU with max texture size of 16384 or better
-
-  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, conf.glVersion.major);
-  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, conf.glVersion.minor);
-  SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
-
   glCtx = SDL_GL_CreateContext(win);
 
   if (!glCtx) {

src/shader.cpp

@@ -115,20 +115,20 @@ void Shader::unbind()
 static void setupShaderSource(GLuint shader, GLenum type,
                               const unsigned char *body, int bodySize)
 {
-	//static const char glesDefine[] = "#define GLSLES\n";
-	static const char fragDefine[] = "";//#define FRAGMENT_SHADER\n";
+	static const char glesDefine[] = "#define GLSLES\n";
+	static const char fragDefine[] = "#define FRAGMENT_SHADER\n";
 
 	const GLchar *shaderSrc[4];
 	GLint shaderSrcSize[4];
 	size_t i = 0;
-/*
+
 	if (gl.glsles)
 	{
 		shaderSrc[i] = glesDefine;
 		shaderSrcSize[i] = sizeof(glesDefine)-1;
 		++i;
 	}
-*/
+
 	if (type == GL_FRAGMENT_SHADER)
 	{
 		shaderSrc[i] = fragDefine;