Add dedicated min soft GPU backend

Intended for slow FPU less systems like GBA/32x

src/Core.h

@@ -146,6 +146,7 @@ typedef cc_uint8  cc_bool;
 #define CC_GFX_BACKEND_D3D11     5
 #define CC_GFX_BACKEND_VULKAN    6
 #define CC_GFX_BACKEND_GL11      7
+#define CC_GFX_BACKEND_SOFTMIN   8
 
 #define CC_SSL_BACKEND_NONE      1
 #define CC_SSL_BACKEND_BEARSSL   2
@@ -490,20 +491,19 @@ typedef cc_uint8  cc_bool;
 	#define CC_BUILD_NOFPU
 	#undef  CC_BUILD_RESOURCES
 	#undef  CC_BUILD_NETWORKING
+	#undef  CC_BUILD_ADVLIGHTING
+	#undef  CC_BUILD_FILESYSTEM
 	#define CC_DISABLE_ANIMATIONS /* Very costly in FPU less system */
 	#define CC_DISABLE_HELDBLOCK  /* Very costly in FPU less system */
 	#define CC_DISABLE_UI
-	#undef  CC_BUILD_ADVLIGHTING
-	#undef  CC_BUILD_FILESYSTEM
 	#define CC_DISABLE_EXTRA_MODELS
-	#define SOFTGPU_DISABLE_ZBUFFER
 	#undef  CC_VAR
 	#define CC_VAR __attribute__((visibility("default"), section(".ewram")))
 	#undef  CC_BIG_VAR
 	#define CC_BIG_VAR __attribute__((section(".ewram")))
 	#define DEFAULT_NET_BACKEND CC_NET_BACKEND_BUILTIN
 	#define DEFAULT_AUD_BACKEND CC_AUD_BACKEND_NULL
-	#define DEFAULT_GFX_BACKEND CC_GFX_BACKEND_SOFTGPU
+	#define DEFAULT_GFX_BACKEND CC_GFX_BACKEND_SOFTMIN
 #elif defined PLAT_NDS
 	#define CC_BUILD_NDS
 	#define CC_BUILD_CONSOLE
@@ -591,14 +591,13 @@ typedef cc_uint8  cc_bool;
 	#define CC_BUILD_NOFPU
 	#undef  CC_BUILD_RESOURCES
 	#undef  CC_BUILD_NETWORKING
+	#undef  CC_BUILD_ADVLIGHTING
+	#undef  CC_BUILD_FILESYSTEM
 	#define CC_DISABLE_ANIMATIONS /* Very costly in FPU less system */
 	#define CC_DISABLE_HELDBLOCK  /* Very costly in FPU less system */
 	#define CC_DISABLE_UI
-	#undef  CC_BUILD_ADVLIGHTING
-	#undef  CC_BUILD_FILESYSTEM
 	#define CC_DISABLE_EXTRA_MODELS
-	#define SOFTGPU_DISABLE_ZBUFFER
-	#define CC_GFX_BACKEND CC_GFX_BACKEND_SOFTGPU
+	#define DEFAULT_GFX_BACKEND CC_GFX_BACKEND_SOFTMIN
 	#define DEFAULT_AUD_BACKEND CC_AUD_BACKEND_NULL
 #elif defined __SYMBIAN32__
 	#define CC_BUILD_SYMBIAN

src/EnvRenderer.c

@@ -704,6 +704,7 @@ static CC_NOINLINE void BuildMapSides(void) {
 	struct VertexTextured* data;
 
 	if (!World.Loaded) return;
+	/*if (Gfx.Limitations & GFX_LIMIT_WORLD_ONLY) return;*/
 	block = Env.SidesBlock;
 
 	if (Blocks.Draw[block] == DRAW_GAS) return;
@@ -756,6 +757,7 @@ static CC_NOINLINE void BuildMapEdges(void) {
 	struct VertexTextured* data;
 
 	if (!World.Loaded) return;
+	/*if (Gfx.Limitations & GFX_LIMIT_WORLD_ONLY) return;*/
 	block = Env.EdgeBlock;
 
 	if (Blocks.Draw[block] == DRAW_GAS) return;

src/Graphics.h

@@ -103,6 +103,8 @@ CC_VAR extern struct _GfxData {
 #define GFX_LIMIT_MAX_VERTEX_SIZE 0x04
 /* Whether the graphics backend is minimal (no fog, clouds, sky) */
 #define GFX_LIMIT_MINIMAL         0x08
+/* Whether the graphics backend shouldn't have horizon/border drawn */
+#define GFX_LIMIT_WORLD_ONLY      0x10
 
 extern const cc_string Gfx_LowPerfMessage;
 

src/Graphics_SoftGPU.c

@@ -39,14 +39,8 @@ void Gfx_FreeState(void) {
 }
 
 void Gfx_Create(void) {
-#if defined CC_BUILD_32X || defined CC_BUILD_GBA
-	Gfx.MaxTexWidth  = 16;
-	Gfx.MaxTexHeight = 16;
-#else
 	Gfx.MaxTexWidth  = 4096;
 	Gfx.MaxTexHeight = 4096;
-#endif
-
 	Gfx.Created      = true;
 	Gfx.BackendType  = CC_GFX_BACKEND_SOFTGPU;
 	Gfx.Limitations  = GFX_LIMIT_MINIMAL;
@@ -166,10 +160,8 @@ static void ClearColorBuffer(void) {
 }
 
 static void ClearDepthBuffer(void) {
-#ifndef SOFTGPU_DISABLE_ZBUFFER
 	int i, size = fb_width * fb_height;
 	for (i = 0; i < size; i++) depthBuffer[i] = 100000000.0f;
-#endif
 }
 
 void Gfx_ClearBuffers(GfxBuffers buffers) {
@@ -664,15 +656,11 @@ static void DrawTriangle3D(Vertex* V0, Vertex* V1, Vertex* V2) {
 			float w = 1 / (ic0 * w0 + ic1 * w1 + ic2 * w2);
 			float z = (ic0 * z0 + ic1 * z1 + ic2 * z2) * w;
 
-#ifndef SOFTGPU_DISABLE_ZBUFFER
 			if (depthTest && (z < 0 || z > depthBuffer[db_index])) continue;
 			if (!colWrite) {
 				if (depthWrite) depthBuffer[db_index] = z;
 				continue;
 			}
-#else
-			if (!colWrite) continue;
-#endif
 
 			if (texturing) {
 				float u = (ic0 * u0 + ic1 * u1 + ic2 * u2) * w;
@@ -687,9 +675,7 @@ static void DrawTriangle3D(Vertex* V0, Vertex* V1, Vertex* V2) {
 			}
 
 			if (gfx_alphaTest && A < 0x80) continue;
-#ifndef SOFTGPU_DISABLE_ZBUFFER
 			if (depthWrite) depthBuffer[db_index] = z;
-#endif
 			int cb_index = y * cb_stride + x;
 			
 			if (!gfx_alphaBlend) {
@@ -1084,10 +1070,8 @@ void Gfx_OnWindowResize(void) {
 	colorBuffer = fb_bmp.scan0;
 	cb_stride   = fb_bmp.width;
 
-#ifndef SOFTGPU_DISABLE_ZBUFFER
 	depthBuffer = Mem_Alloc(fb_width * fb_height, 4, "depth buffer");
 	db_stride   = fb_width;
-#endif
 
 	Gfx_SetViewport(0, 0, Game.Width, Game.Height);
 	Gfx_SetScissor (0, 0, Game.Width, Game.Height);