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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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
* of the License, 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "backends/graphics/opengl/texture.h"
#include "backends/graphics/opengl/extensions.h"
#include "backends/graphics/opengl/debug.h"
#include "common/rect.h"
#include "common/textconsole.h"
namespace OpenGL {
static GLuint nextHigher2(GLuint v) {
if (v == 0)
return 1;
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
return ++v;
}
Texture::Texture(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format)
: _glIntFormat(glIntFormat), _glFormat(glFormat), _glType(glType), _format(format), _glFilter(GL_NEAREST),
_glTexture(0), _textureData(), _userPixelData(), _allDirty(false) {
recreateInternalTexture();
}
Texture::~Texture() {
releaseInternalTexture();
_textureData.free();
}
void Texture::releaseInternalTexture() {
GLCALL(glDeleteTextures(1, &_glTexture));
_glTexture = 0;
}
void Texture::recreateInternalTexture() {
// Get a new texture name.
GLCALL(glGenTextures(1, &_glTexture));
// Set up all texture parameters.
GLCALL(glBindTexture(GL_TEXTURE_2D, _glTexture));
GLCALL(glPixelStorei(GL_UNPACK_ALIGNMENT, 1));
GLCALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, _glFilter));
GLCALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, _glFilter));
GLCALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
GLCALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
// In case there is an actual texture setup we reinitialize it.
if (_textureData.getPixels()) {
// Allocate storage for OpenGL texture.
GLCALL(glTexImage2D(GL_TEXTURE_2D, 0, _glIntFormat, _textureData.w,
_textureData.h, 0, _glFormat, _glType, NULL));
// Mark dirts such that it will be completely refreshed the next time.
flagDirty();
}
}
void Texture::enableLinearFiltering(bool enable) {
if (enable) {
_glFilter = GL_LINEAR;
} else {
_glFilter = GL_NEAREST;
}
GLCALL(glBindTexture(GL_TEXTURE_2D, _glTexture));
GLCALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, _glFilter));
GLCALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, _glFilter));
}
void Texture::allocate(uint width, uint height) {
uint texWidth = width, texHeight = height;
if (!g_extNPOTSupported) {
texWidth = nextHigher2(texWidth);
texHeight = nextHigher2(texHeight);
}
// In case the needed texture dimension changed we will reinitialize the
// texture.
if (texWidth != _textureData.w || texHeight != _textureData.h) {
// Create a buffer for the texture data.
_textureData.create(texWidth, texHeight, _format);
// Set the texture.
GLCALL(glBindTexture(GL_TEXTURE_2D, _glTexture));
// Allocate storage for OpenGL texture.
GLCALL(glTexImage2D(GL_TEXTURE_2D, 0, _glIntFormat, _textureData.w,
_textureData.h, 0, _glFormat, _glType, NULL));
}
// Create a sub-buffer for raw access.
_userPixelData = _textureData.getSubArea(Common::Rect(width, height));
}
void Texture::copyRectToTexture(uint x, uint y, uint w, uint h, const void *srcPtr, uint srcPitch) {
Graphics::Surface *dstSurf = getSurface();
assert(x + w <= dstSurf->w);
assert(y + h <= dstSurf->h);
// *sigh* Common::Rect::extend behaves unexpected whenever one of the two
// parameters is an empty rect. Thus, we check whether the current dirty
// area is valid. In case it is not we simply use the parameters as new
// dirty area. Otherwise, we simply call extend.
if (_dirtyArea.isEmpty()) {
_dirtyArea = Common::Rect(x, y, x + w, y + h);
} else {
_dirtyArea.extend(Common::Rect(x, y, x + w, y + h));
}
const byte *src = (const byte *)srcPtr;
byte *dst = (byte *)dstSurf->getBasePtr(x, y);
const uint pitch = dstSurf->pitch;
const uint bytesPerPixel = dstSurf->format.bytesPerPixel;
if (srcPitch == pitch && x == 0 && w == dstSurf->w) {
memcpy(dst, src, h * pitch);
} else {
while (h-- > 0) {
memcpy(dst, src, w * bytesPerPixel);
dst += pitch;
src += srcPitch;
}
}
}
void Texture::fill(uint32 color) {
Graphics::Surface *dst = getSurface();
dst->fillRect(Common::Rect(dst->w, dst->h), color);
flagDirty();
}
void Texture::draw(GLuint x, GLuint y, GLuint w, GLuint h) {
// Only do any processing when the Texture is initialized.
if (!_textureData.getPixels()) {
return;
}
// First update any potentional changes.
updateTexture();
// Set the texture.
GLCALL(glBindTexture(GL_TEXTURE_2D, _glTexture));
// Calculate the texture rect that will be drawn.
const GLfloat texWidth = (GLfloat)_userPixelData.w / _textureData.w;
const GLfloat texHeight = (GLfloat)_userPixelData.h / _textureData.h;
const GLfloat texcoords[4*2] = {
0, 0,
texWidth, 0,
0, texHeight,
texWidth, texHeight
};
GLCALL(glTexCoordPointer(2, GL_FLOAT, 0, texcoords));
// Calculate the screen rect where the texture will be drawn.
const GLshort vertices[4*2] = {
(GLshort)x, (GLshort)y,
(GLshort)(x + w), (GLshort)y,
(GLshort)x, (GLshort)(y + h),
(GLshort)(x + w), (GLshort)(y + h)
};
GLCALL(glVertexPointer(2, GL_SHORT, 0, vertices));
// Draw the texture to the screen buffer.
GLCALL(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));
}
void Texture::updateTexture() {
if (!isDirty()) {
return;
}
Common::Rect dirtyArea = getDirtyArea();
// In case we use linear filtering we might need to duplicate the last
// pixel row/column to avoid glitches with filtering.
if (_glFilter == GL_LINEAR) {
if (dirtyArea.right == _userPixelData.w && _userPixelData.w != _textureData.w) {
uint height = dirtyArea.height();
const byte *src = (const byte *)_textureData.getBasePtr(_userPixelData.w - 1, dirtyArea.top);
byte *dst = (byte *)_textureData.getBasePtr(_userPixelData.w, dirtyArea.top);
while (height-- > 0) {
memcpy(dst, src, _textureData.format.bytesPerPixel);
dst += _textureData.pitch;
src += _textureData.pitch;
}
// Extend the dirty area.
++dirtyArea.right;
}
if (dirtyArea.bottom == _userPixelData.h && _userPixelData.h != _textureData.h) {
const byte *src = (const byte *)_textureData.getBasePtr(dirtyArea.left, _userPixelData.h - 1);
byte *dst = (byte *)_textureData.getBasePtr(dirtyArea.left, _userPixelData.h);
memcpy(dst, src, dirtyArea.width() * _textureData.format.bytesPerPixel);
// Extend the dirty area.
++dirtyArea.bottom;
}
}
// Set the texture.
GLCALL(glBindTexture(GL_TEXTURE_2D, _glTexture));
// Update the actual texture.
// Although we keep track of the dirty part of the texture buffer we
// cannot take advantage of the left/right boundries here because it is
// not possible to specify a pitch to glTexSubImage2D. To be precise, with
// plain OpenGL we could set GL_UNPACK_ROW_LENGTH to achieve this. However,
// OpenGL ES 1.0 does not support GL_UNPACK_ROW_LENGTH. Thus, we are left
// with the following options:
//
// 1) (As we do right now) Simply always update the whole texture lines of
// rect changed. This is simplest to implement. In case performance is
// really an issue we can think of switching to another method.
//
// 2) Copy the dirty rect to a temporary buffer and upload that by using
// glTexSubImage2D. This is what the Android backend does. It is more
// complicated though.
//
// 3) Use glTexSubImage2D per line changed. This is what the old OpenGL
// graphics manager did but it is much slower! Thus, we do not use it.
GLCALL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, dirtyArea.top, _textureData.w, dirtyArea.height(),
_glFormat, _glType, _textureData.getBasePtr(0, dirtyArea.top)));
// We should have handled everything, thus not dirty anymore.
clearDirty();
}
Common::Rect Texture::getDirtyArea() const {
if (_allDirty) {
return Common::Rect(_userPixelData.w, _userPixelData.h);
} else {
return _dirtyArea;
}
}
TextureCLUT8::TextureCLUT8(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format)
: Texture(glIntFormat, glFormat, glType, format), _clut8Data(), _palette(new byte[256 * format.bytesPerPixel]) {
memset(_palette, 0, sizeof(byte) * format.bytesPerPixel);
}
TextureCLUT8::~TextureCLUT8() {
delete[] _palette;
_palette = nullptr;
_clut8Data.free();
}
void TextureCLUT8::allocate(uint width, uint height) {
Texture::allocate(width, height);
// We only need to reinitialize our CLUT8 surface when the output size
// changed.
if (width == _clut8Data.w && width == _clut8Data.h) {
return;
}
_clut8Data.create(width, height, Graphics::PixelFormat::createFormatCLUT8());
}
Graphics::PixelFormat TextureCLUT8::getFormat() const {
return Graphics::PixelFormat::createFormatCLUT8();
}
namespace {
template<typename ColorType>
inline void convertPalette(ColorType *dst, const byte *src, uint colors, const Graphics::PixelFormat &format) {
while (colors-- > 0) {
*dst++ = format.RGBToColor(src[0], src[1], src[2]);
src += 3;
}
}
} // End of anonymous namespace
void TextureCLUT8::setPalette(uint start, uint colors, const byte *palData) {
const Graphics::PixelFormat &hardwareFormat = getHardwareFormat();
if (hardwareFormat.bytesPerPixel == 2) {
convertPalette<uint16>((uint16 *)_palette + start, palData, colors, hardwareFormat);
} else if (hardwareFormat.bytesPerPixel == 4) {
convertPalette<uint32>((uint32 *)_palette + start, palData, colors, hardwareFormat);
} else {
warning("TextureCLUT8::setPalette: Unsupported pixel depth: %d", hardwareFormat.bytesPerPixel);
}
// A palette changes means we need to refresh the whole surface.
flagDirty();
}
namespace {
template<typename PixelType>
inline void doPaletteLookUp(PixelType *dst, const byte *src, uint width, uint height, uint dstPitch, uint srcPitch, const PixelType *palette) {
uint srcAdd = srcPitch - width;
uint dstAdd = dstPitch - width * sizeof(PixelType);
while (height-- > 0) {
for (uint x = width; x > 0; --x) {
*dst++ = palette[*src++];
}
dst = (PixelType *)((byte *)dst + dstAdd);
src += srcAdd;
}
}
} // End of anonymous namespace
void TextureCLUT8::updateTexture() {
if (!isDirty()) {
return;
}
// Do the palette look up
Graphics::Surface *outSurf = Texture::getSurface();
Common::Rect dirtyArea = getDirtyArea();
if (outSurf->format.bytesPerPixel == 2) {
doPaletteLookUp<uint16>((uint16 *)outSurf->getBasePtr(dirtyArea.left, dirtyArea.top),
(const byte *)_clut8Data.getBasePtr(dirtyArea.left, dirtyArea.top),
dirtyArea.width(), dirtyArea.height(),
outSurf->pitch, _clut8Data.pitch, (const uint16 *)_palette);
} else if (outSurf->format.bytesPerPixel == 4) {
doPaletteLookUp<uint32>((uint32 *)outSurf->getBasePtr(dirtyArea.left, dirtyArea.top),
(const byte *)_clut8Data.getBasePtr(dirtyArea.left, dirtyArea.top),
dirtyArea.width(), dirtyArea.height(),
outSurf->pitch, _clut8Data.pitch, (const uint32 *)_palette);
} else {
warning("TextureCLUT8::updateTexture: Unsupported pixel depth: %d", outSurf->format.bytesPerPixel);
}
// Do generic handling of updating the texture.
Texture::updateTexture();
}
} // End of namespace OpenGL
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