pcsx2/plugins/GSdx/GSTextureOGL.cpp

/*
 *	Copyright (C) 2011-2011 Gregory hainaut
 *	Copyright (C) 2007-2009 Gabest
 *
 *  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; either version 2, or (at your option)
 *  any later version.
 *
 *  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 for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA USA.
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */

#include "stdafx.h"
#include <limits.h>
#include "GSTextureOGL.h"
static GLuint g_state_texture_unit = -1;
static GLuint g_state_texture_id[7] = {0, 0, 0, 0, 0, 0, 0};
static GLuint g_color0 = 0;
static GLuint g_color1 = 0;
static GLuint g_depth = 0;

// FIXME: check if it possible to always use those setup by default
// glPixelStorei(GL_PACK_ALIGNMENT, 1);
// glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

GSTextureOGL::GSTextureOGL(int type, int w, int h, bool msaa, int format, GLuint fbo_read)
	: m_pbo_id(0),
	  m_pbo_size(0)
{
	// *************************************************************
	// Opengl world

	// Render work in parallal with framebuffer object (FBO) http://www.opengl.org/wiki/Framebuffer_Objects
	// render are attached to FBO through : gl_FramebufferRenderbuffer. You can query the number of colorattachement with GL_MAX_COLOR_ATTACHMENTS
	// FBO   :  constructor -> gl_GenFramebuffers, gl_DeleteFramebuffers
	//			binding     -> gl_BindFramebuffer (target can be read/write/both)
	//			blit		-> gl_BlitFramebuffer (read FB to draw FB)
	//			info		-> gl_IsFramebuffer, glGetFramebufferAttachmentParameter, gl_CheckFramebufferStatus
	//
	// There are two types of framebuffer-attachable images; texture images and renderbuffer images.
	// If an image of a texture object is attached to a framebuffer, OpenGL performs "render to texture".
	// And if an image of a renderbuffer object is attached to a framebuffer, then OpenGL performs "offscreen rendering".
	// Blitting:
	// gl_DrawBuffers
	// glReadBuffer
	// gl_BlitFramebuffer

	// *************************************************************
	// m_size.x = w;
	// m_size.y = h;
	// FIXME
	m_size.x = max(1,w);
	m_size.y = max(1,h);
	m_format = format;
	m_type   = type;
	m_msaa   = msaa;
	m_fbo_read = fbo_read;

	// Generate the buffer
	switch (m_type) {
		case GSTexture::Offscreen:
			//FIXME I not sure we need a pixel buffer object. It seems more a texture
			// gl_GenBuffers(1, &m_texture_id);
			// m_texture_target = GL_PIXEL_UNPACK_BUFFER;
			// ASSERT(0);
			// Note there is also a buffer texture!!!
			// http://www.opengl.org/wiki/Buffer_Texture
			// Note: in this case it must use in GLSL
			// gvec texelFetch(gsampler sampler, ivec texCoord, int lod[, int sample]);
			// corollary we can maybe use it for multisample stuff
		case GSTexture::Texture:
		case GSTexture::RenderTarget:
		case GSTexture::DepthStencil:
			glGenTextures(1, &m_texture_id);
			m_texture_target = GL_TEXTURE_2D;
			break;
		case GSTexture::Backbuffer:
			m_texture_target = 0;
			m_texture_id = 0;
			break;
		default:
			break;
	}
	// Extra buffer to handle various pixel transfer
	gl_GenBuffers(1, &m_pbo_id);

#if 0
	uint32 msaa_level;
	if (m_msaa) {
		// FIXME  which level of MSAA
		msaa_level = 1;
	} else {
		msaa_level = 0;
	}
#endif

	// Allocate the buffer
	switch (m_type) {
		case GSTexture::Offscreen:
			// Allocate a pbo with the texture
			if (m_format == GL_RGBA8) m_pbo_size = m_size.x * m_size.y * 4;
			else if (m_format == GL_R16UI) m_pbo_size = m_size.x * m_size.y * 2;
			else {
				fprintf(stderr, "wrong texture pixel format :%x\n", m_format);
				ASSERT(0); // TODO Later
			}

			gl_BindBuffer(GL_PIXEL_PACK_BUFFER, m_pbo_id);
			gl_BufferData(GL_PIXEL_PACK_BUFFER, m_pbo_size, NULL, GL_STREAM_DRAW);
			gl_BindBuffer(GL_PIXEL_PACK_BUFFER, 0);
			ASSERT(!m_msaa);

		case GSTexture::DepthStencil:
		case GSTexture::RenderTarget:
		case GSTexture::Texture:
			EnableUnit(3);
			if (m_msaa) {
				ASSERT(m_texture_target == GL_TEXTURE_2D_MULTISAMPLE);
				// Require a recent GL4.3 extension
				//gl_TexStorage2DMultisample(m_texture_target, msaa_level, m_format, m_size.x, m_size.y, false);
			} else {
				gl_TexStorage2D(m_texture_target, 1,  m_format, m_size.x, m_size.y);
			}
			break;
		default: break;
	}
}

GSTextureOGL::~GSTextureOGL()
{
	/* Unbind the texture from our local state */
	for (uint32 i = 0; i < 7; i++)
		if (g_state_texture_id[i] == m_texture_id)
			g_state_texture_id[i] = 0;

	gl_DeleteBuffers(1, &m_pbo_id);
	glDeleteTextures(1, &m_texture_id);
}

void GSTextureOGL::Attach(GLenum attachment)
{
	switch(attachment) {
		case GL_COLOR_ATTACHMENT0:
		if (g_color0 != m_texture_id) {
				g_color0 = m_texture_id;
			gl_FramebufferTexture2D(GL_DRAW_FRAMEBUFFER, attachment, m_texture_target, m_texture_id, 0);
		}
			break;
		case GL_COLOR_ATTACHMENT1:
		if (g_color1 != m_texture_id) {
				g_color1 = m_texture_id;
			gl_FramebufferTexture2D(GL_DRAW_FRAMEBUFFER, attachment, m_texture_target, m_texture_id, 0);
		}
			break;
		case GL_DEPTH_STENCIL_ATTACHMENT:
		if (g_depth != m_texture_id) {
			gl_FramebufferTexture2D(GL_DRAW_FRAMEBUFFER, attachment, m_texture_target, m_texture_id, 0);
			g_depth = m_texture_id;
		}
			break;
		default:
			gl_FramebufferTexture2D(GL_DRAW_FRAMEBUFFER, attachment, m_texture_target, m_texture_id, 0);
			break;
	}

	// FIXME DEBUG
	//fprintf(stderr, "FB status %x\n", gl_CheckFramebufferStatus(GL_FRAMEBUFFER));
}

void GSTextureOGL::AttachRead(GLenum attachment)
{
	gl_FramebufferTexture2D(GL_READ_FRAMEBUFFER, attachment, m_texture_target, m_texture_id, 0);
	glReadBuffer(attachment);
}

bool GSTextureOGL::Update(const GSVector4i& r, const void* data, int pitch)
{
	if (m_type == GSTexture::DepthStencil || m_type == GSTexture::Offscreen) ASSERT(0);

	// FIXME warning order of the y axis
	// FIXME I'm not confident with GL_UNSIGNED_BYTE type

	EnableUnit(4);

	// pitch is in byte wherease GL_UNPACK_ROW_LENGTH is in pixel
	GLenum format = GL_RGBA;
	GLenum type = GL_UNSIGNED_BYTE;
	switch (m_format) {
		case GL_RGBA8:
			glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
			glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch>>2);
			format = GL_RGBA;
			type = GL_UNSIGNED_BYTE;
			break;
		case GL_R16UI:
			glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
			glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch>>1);
			format = GL_RED;
			type = GL_UNSIGNED_SHORT;
			break;
		case GL_R8:
			glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
			glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
			format = GL_RED;
			type = GL_UNSIGNED_BYTE;
			break;
		default:
			fprintf(stderr, "wrong texture pixel format :%x\n", m_format);
			ASSERT(0);
	}

#ifdef _LINUX
	if (GLLoader::fglrx_buggy_driver) {
		// FIXME : it crash on colin mcrae rally 3 (others game too) when the texture is small
		//if ((pitch >> 2) == 32 || r.width() < 32 || r.height() < 32) {
		if ((r.width() < 32) || (pitch == 128 && r.width() == 32)) {
#ifdef ENABLE_OGL_DEBUG
			fprintf(stderr, "Skip Texture %dx%d with a pitch of %d pixel. Type %x\n", m_size.x, m_size.y, pitch >>2, m_format);
			fprintf(stderr, "Box (%d,%d)x(%d,%d)\n", r.x, r.y, r.width(), r.height());
#endif

			glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); // Restore default behavior
			return false;
		}
	}
#endif

	glTexSubImage2D(m_texture_target, 0, r.x, r.y, r.width(), r.height(), format, type, data);

	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); // Restore default behavior

	return true;
#if 0
	if(m_dev && m_texture)
	{
		D3D11_BOX box = {r.left, r.top, 0, r.right, r.bottom, 1};

		m_ctx->UpdateSubresource(m_texture, 0, &box, data, pitch, 0);

		return true;
	}

	return false;
#endif
}

void GSTextureOGL::EnableUnit(uint32 unit)
{
	/* Not a real texture */
	if (IsBackbuffer()) {
		return;
	}

	if (g_state_texture_unit != unit) {
		gl_ActiveTexture(GL_TEXTURE0 + unit);
		g_state_texture_unit = unit;
	}
	if (g_state_texture_id[unit] != m_texture_id) {
		g_state_texture_id[unit] = m_texture_id;
		glBindTexture(m_texture_target, m_texture_id);
	}
}

bool GSTextureOGL::Map(GSMap& m, const GSVector4i* r)
{
	// The function allow to modify the texture from the CPU
	// Set m.bits <- pointer to the data
	// Set m.pitch <- size of a row
	// I think in opengl we need to copy back the data to the RAM: glReadPixels — read a block of pixels from the frame buffer
	//
	// gl_MapBuffer — map a buffer object's data store
	// Can be used on GL_PIXEL_UNPACK_BUFFER or GL_TEXTURE_BUFFER
	if (m_type == GSTexture::Offscreen) {
		// Bind the texture to the read framebuffer to avoid any disturbance
		EnableUnit(5);
		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, m_fbo_read);
		gl_FramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_texture_target, m_texture_id, 0);
		glReadBuffer(GL_COLOR_ATTACHMENT0);

		// FIXME It might be possible to only read a subrange of the texture based on r object
		// Load the PBO with the data
		gl_BindBuffer(GL_PIXEL_PACK_BUFFER, m_pbo_id);
		if (m_format == GL_RGBA8) {
			glPixelStorei(GL_PACK_ALIGNMENT, 4);
			glReadPixels(0, 0, m_size.x, m_size.y, GL_RGBA, GL_UNSIGNED_BYTE, 0);
			m.pitch = m_size.x * 4;
		} else if (m_format == GL_R16UI) {
			glPixelStorei(GL_PACK_ALIGNMENT, 2);
			glReadPixels(0, 0, m_size.x, m_size.y, GL_RED_INTEGER, GL_UNSIGNED_SHORT, 0);
			m.pitch = m_size.x * 2;
		} else if (m_format == GL_R8) {
			glPixelStorei(GL_PACK_ALIGNMENT, 1);
			glReadPixels(0, 0, m_size.x, m_size.y, GL_RED, GL_UNSIGNED_BYTE, 0);
			m.pitch = m_size.x;
		} else {
			fprintf(stderr, "wrong texture pixel format :%x\n", m_format);
			ASSERT(0);
		}
		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, 0);

		// Give access from the CPU
		m.bits = (uint8*) gl_MapBufferRange(GL_PIXEL_PACK_BUFFER, 0, m_pbo_size, GL_MAP_READ_BIT);

		if ( m.bits ) {
			return true;
		} else {
			fprintf(stderr, "bad mapping of the pbo\n");
			gl_BindBuffer(GL_PIXEL_PACK_BUFFER, 0);
			return false;
		}
	}

	return false;
#if 0
	if(m_texture && m_desc.Usage == D3D11_USAGE_STAGING)
	{
		D3D11_MAPPED_SUBRESOURCE map;

		if(SUCCEEDED(m_ctx->Map(m_texture, 0, D3D11_MAP_READ_WRITE, 0, &map)))
		{
			m.bits = (uint8*)map.pData;
			m.pitch = (int)map.RowPitch;

			return true;
		}
	}

	return false;
#endif
}

void GSTextureOGL::Unmap()
{
	if (m_type == GSTexture::Offscreen) {
		gl_UnmapBuffer(GL_PIXEL_PACK_BUFFER);
		gl_BindBuffer(GL_PIXEL_PACK_BUFFER, 0);

	}
}

#ifndef _WINDOWS

#pragma pack(push, 1)

struct BITMAPFILEHEADER
{
	uint16 bfType;
	uint32 bfSize;
	uint16 bfReserved1;
	uint16 bfReserved2;
	uint32 bfOffBits;
};

struct BITMAPINFOHEADER
{
	uint32 biSize;
	int32 biWidth;
	int32 biHeight;
	uint16 biPlanes;
	uint16 biBitCount;
	uint32 biCompression;
	uint32 biSizeImage;
	int32 biXPelsPerMeter;
	int32 biYPelsPerMeter;
	uint32 biClrUsed;
	uint32 biClrImportant;
};

#define BI_RGB 0

#pragma pack(pop)

#endif
void GSTextureOGL::Save(const string& fn, const void* image, uint32 pitch)
{
	// Build a BMP file
	FILE* fp = fopen(fn.c_str(), "wb");

	BITMAPINFOHEADER bih;

	memset(&bih, 0, sizeof(bih));

	bih.biSize = sizeof(bih);
	bih.biWidth = m_size.x;
	bih.biHeight = m_size.y;
	bih.biPlanes = 1;
	bih.biBitCount = 32;
	bih.biCompression = BI_RGB;
	bih.biSizeImage = m_size.x * m_size.y << 2;

	BITMAPFILEHEADER bfh;

	memset(&bfh, 0, sizeof(bfh));

	uint8* bfType = (uint8*)&bfh.bfType;

	// bfh.bfType = 'MB';
	bfType[0] = 0x42;
	bfType[1] = 0x4d;
	bfh.bfOffBits = sizeof(bfh) + sizeof(bih);
	bfh.bfSize = bfh.bfOffBits + bih.biSizeImage;
	bfh.bfReserved1 = bfh.bfReserved2 = 0;

	fwrite(&bfh, 1, sizeof(bfh), fp);
	fwrite(&bih, 1, sizeof(bih), fp);

	uint8* data = (uint8*)image + (m_size.y - 1) * pitch;

	for(int h = m_size.y; h > 0; h--, data -= pitch)
	{
		if (false && IsDss()) {
			// Only get the depth and convert it to an integer
			uint8* better_data = data;
			for (int w = m_size.x; w > 0; w--, better_data += 8) {
				float* input = (float*)better_data;
				// FIXME how to dump 32 bits value into 8bits component color
				GLuint depth_integer = (GLuint)(*input * (float)UINT_MAX);
				uint8 r = (depth_integer >>  0) & 0xFF;
				uint8 g = (depth_integer >>  8) & 0xFF;
				uint8 b = (depth_integer >> 16) & 0xFF;
				uint8 a = (depth_integer >> 24) & 0xFF;

				fwrite(&r, 1, 1, fp);
				fwrite(&g, 1, 1, fp);
				fwrite(&b, 1, 1, fp);
				fwrite(&a, 1, 1, fp);
			}
		} else {
			// swap red and blue
			uint8* better_data = data;
			for (int w = m_size.x; w > 0; w--, better_data += 4) {
				uint8 red = better_data[2];
				better_data[2] = better_data[0];
				better_data[0] = red;
				fwrite(better_data, 1, 4, fp);
			}
		}
	}

	fclose(fp);
}

bool GSTextureOGL::Save(const string& fn, bool dds)
{
	// Collect the texture data
	uint32 pitch = 4 * m_size.x;
	char* image = (char*)malloc(pitch * m_size.y);
	bool status = true;

	// FIXME instead of swapping manually B and R maybe you can request the driver to do it
	// for us
	if (IsBackbuffer()) {
		//glReadBuffer(GL_BACK);
		//gl_BindFramebuffer(GL_READ_FRAMEBUFFER, 0);
		glReadPixels(0, 0, m_size.x, m_size.y, GL_RGBA, GL_UNSIGNED_BYTE, image);
	} else if(IsDss()) {
		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, m_fbo_read);

		gl_FramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, m_texture_target, m_texture_id, 0);
		glReadPixels(0, 0, m_size.x, m_size.y, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, image);

		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, 0);
	} else {
		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, m_fbo_read);

		EnableUnit(6);
		gl_FramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_texture_target, m_texture_id, 0);

		glReadBuffer(GL_COLOR_ATTACHMENT0);
		if (m_format == GL_RGBA8)
			glReadPixels(0, 0, m_size.x, m_size.y, GL_RGBA, GL_UNSIGNED_BYTE, image);
		else if (m_format == GL_R16UI)
		{
			glReadPixels(0, 0, m_size.x, m_size.y, GL_RED_INTEGER, GL_UNSIGNED_SHORT, image);
			// Not supported in Save function
			status = false;
		}
		else if (m_format == GL_R8)
		{
			glReadPixels(0, 0, m_size.x, m_size.y, GL_RED, GL_UNSIGNED_BYTE, image);
			// Not supported in Save function
			status = false;
		}

		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, 0);
	}

	if (status) Save(fn, image, pitch);
	free(image);

	return status;
}