Add a few (disabled) lines of code to kinda-simulate the Mali feature set.

GPU/Common/ShaderId.cpp

@@ -166,12 +166,13 @@ void ComputeVertexShaderID(VShaderID *id_out, u32 vertType, bool useHWTransform,
 	*id_out = id;
 }
 
-
 static const char * const alphaTestFuncs[] = { "NEVER", "ALWAYS", "==", "!=", "<", "<=", ">", ">=" };
+static_assert(ARRAY_SIZE(alphaTestFuncs) == 8);
 static const char * const logicFuncs[] = {
 	"CLEAR", "AND", "AND_REV", "COPY", "AND_INV", "NOOP", "XOR", "OR",
 	"NOR", "EQUIV", "INVERTED", "OR_REV", "COPY_INV", "OR_INV", "NAND", "SET",
 };
+static_assert(ARRAY_SIZE(logicFuncs) == 16);
 
 static bool MatrixNeedsProjection(const float m[12], GETexProjMapMode mode) {
 	// For GE_PROJMAP_UV, we can ignore m[8] since it multiplies to zero.

GPU/Common/ShaderUniforms.cpp

@@ -90,7 +90,6 @@ void BaseUpdateUniforms(UB_VS_FS_Base *ub, uint64_t dirtyUniforms, bool useBuffe
 		ub->rasterOffset[1] = gstate.getOffsetY();
 		ub->minZmaxZ[0] = (float)gstate.getDepthRangeMin();
 		ub->minZmaxZ[1] = (float)gstate.getDepthRangeMax();
-
 		// test sine wave
 		// ub->minZmaxZ[0] = (sin(time_now_d()) * 0.5f + 0.5f) * 65536.0;
 	}

GPU/Common/ShaderUniforms.h

@@ -127,17 +127,13 @@ void UpdateFogCoef(const GEState &state, float fogCoef[2]);
 
 // This happens so much that I want it inline.
 inline void UpdateUVScaleOff(const GEState &state, float uvScaleOff[4]) {
-	float widthFactor;
-	float heightFactor;
 	if (gstate_c.textureIsFramebuffer) {
-		widthFactor = (float)gstate.getTextureWidth(0) / (float)gstate_c.curTextureWidth;
-		heightFactor = (float)gstate.getTextureHeight(0) / (float)gstate_c.curTextureHeight;
+		uvScaleOff[0] = (float)gstate.getTextureWidth(0) / (float)gstate_c.curTextureWidth;
+		uvScaleOff[1] = (float)gstate.getTextureHeight(0) / (float)gstate_c.curTextureHeight;
 	} else {
-		widthFactor = 1.0f;
-		heightFactor = 1.0f;
+		uvScaleOff[0] = 1.0f;
+		uvScaleOff[1] = 1.0f;
 	}
-	uvScaleOff[0] = widthFactor;
-	uvScaleOff[1] = heightFactor;
 	uvScaleOff[2] = 0.0f;
 	uvScaleOff[3] = 0.0f;
 }

GPU/GPUCommonHW.cpp

@@ -621,6 +621,13 @@ u32 GPUCommonHW::CheckGPUFeatures() const {
 		features |= GPU_USE_VS_RANGE_CULLING;
 	}
 
+	// Set this to true to easily test our fallback shaders for depth clamp and min/max clipping.
+	// DO NOT check that in! This should be false normally.
+	constexpr bool simulateOldMali = false;
+	if (simulateOldMali) {
+		features &= ~(GPU_USE_CLIP_DISTANCE | GPU_USE_CULL_DISTANCE | GPU_USE_DEPTH_CLAMP);
+	}
+
 	return features;
 }