ppsspp/GPU/GPU.h

// Copyright (c) 2015- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.


#pragma once

#include <cstring>
#include <cstdint>

enum GPUCore : int;

class GPUCommon;
class GPUCommon;
class GraphicsContext;

// PSP rasterization has two outputs, color and depth. Stencil is packed
// into the alpha channel of color (if exists), so possibly RASTER_COLOR
// should be named RASTER_COLOR_STENCIL but it gets kinda hard to read.
enum RasterChannel : uint8_t {
	RASTER_COLOR = 0,
	RASTER_DEPTH = 1,
};

enum SkipDrawReasonFlags {
	SKIPDRAW_SKIPFRAME = 1,
	SKIPDRAW_NON_DISPLAYED_FB = 2,   // Skip drawing to FBO:s that have not been displayed.
	SKIPDRAW_BAD_FB_TEXTURE = 4,
	SKIPDRAW_WINDOW_MINIMIZED = 8, // Don't draw when the host window is minimized.
};

enum class ShaderDepalMode {
	OFF = 0,
	NORMAL = 1,
	SMOOTHED = 2,
	CLUT8_8888 = 3,  // Read 8888 framebuffer as 8-bit CLUT.
};

// Global GPU-related utility functions. 
// Nothing directly Ge-related in here.

// PSP uses a curious 24-bit float - it's the top 24 bits of a regular IEEE754 32-bit float.
// This is used for light positions, transform matrices, you name it.
inline float getFloat24(unsigned int data) {
	data <<= 8;
	float f;
	memcpy(&f, &data, 4);
	return f;
}

// in case we ever want to generate PSP display lists...
inline unsigned int toFloat24(float f) {
	unsigned int i;
	memcpy(&i, &f, 4);
	return i >> 8;
}

// TODO: Not completely sure about the exact mechanics here, or where we need to use this.
// Useful to experiment with.
inline float roundToFloat24(float f) {
	unsigned int i;
	memcpy(&i, &f, 4);
	i &= 0xFFFFFF00;
	i += 0x80;  // TODO: Subtract for negative numbers?
	float retval;
	memcpy(&retval, &i, 4);
	return retval;
}

inline float truncateToFloat24(float f) {
	unsigned int i;
	memcpy(&i, &f, 4);
	i &= 0xFFFFFF00;
	float retval;
	memcpy(&retval, &i, 4);
	return retval;
}

// TODO: Possibly use macros to disable expensive parts of stats tracking in release builds.
struct GPUStatsPerFrame {
	int numEnqueue;
	int numUpdateStall;
	int numDrawSyncs;
	int numListSyncs;
	int numDrawCalls;
	int numVertexDecodes;
	int numCulledDraws;
	int numFlushes;
	int numSoftTransformedDraws;
	int numSoftClippedTriangles;
	int numBBOXJumps;
	int numVertsSubmitted;
	int numVertsDecoded;
	int numUncachedVertsDrawn;
	int numTextureInvalidations;
	int numTexturesChanged;
	int numTextureInvalidationsByFramebuffer;
	int numTexturesHashed;
	int numTextureDataBytesHashed;
	int numTexturesDecoded;
	int numFramebufferEvaluations;
	int numFBOsCreated;
	int numBlockingReadbacks;
	int numReadbacks;
	int numUploads;
	int numCachedUploads;
	int numDepal;
	int numClears;
	int numDepthCopies;
	int numReinterpretCopies;
	int numColorCopies;
	int numCopiesForShaderBlend;
	int numCopiesForSelfTex;
	int numBlockTransfers;
	int numReplacerTrackedTex;
	int numCachedReplacedTextures;
	int numClutTextures;
	double msProcessingDisplayLists;
	double msPrepareDepth;
	double msCullDepth;
	double msRasterizeDepth;
	double msRasterTimeAvailable;
	int vertexGPUCycles;
	int otherGPUCycles;
	int numDepthRasterPrims;
	int numDepthRasterEarlySize;
	int numDepthRasterNoPixels;
	int numDepthRasterTooSmall;
	int numDepthRasterZCulled;
	int numDepthEarlyBoxCulled;
};

struct GPUStatsTotals {
	// Flip count. Doesn't really belong here.
	int numFlips;
};

// The ToString function lives in GPUCommonHW.cpp.
struct GPUStatistics {
	void Reset() {
		ResetFrame();
		totals = {};
	}

	void ResetFrame() {
		perFrame = {};
	}

	// Flip count. Doesn't really belong here.
	GPUStatsPerFrame perFrame;
	GPUStatsTotals totals;
};

extern GPUStatistics gpuStats;
extern GPUCommon *gpu;
extern GPUCommon *gpu;

namespace Draw {
	class DrawContext;
}

bool GPU_Init(GPUCore gpuCore, GraphicsContext *ctx, Draw::DrawContext *draw);
void GPU_Shutdown();

const char *RasterChannelToString(RasterChannel channel);