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Diffstat (limited to 'backends/graphics/opengl/gltexture.cpp')
| -rw-r--r-- | backends/graphics/opengl/gltexture.cpp | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/backends/graphics/opengl/gltexture.cpp b/backends/graphics/opengl/gltexture.cpp deleted file mode 100644 index ca674563df..0000000000 --- a/backends/graphics/opengl/gltexture.cpp +++ /dev/null @@ -1,225 +0,0 @@ -/* 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 "common/scummsys.h" - -#if defined(USE_OPENGL) - -#include "backends/graphics/opengl/gltexture.h" -#include "backends/graphics/opengl/glerrorcheck.h" - -#include "common/rect.h" -#include "common/array.h" -#include "common/util.h" -#include "common/tokenizer.h" - -// Supported GL extensions -static bool npot_supported = false; -static bool glext_inited = false; - -/*static inline GLint xdiv(int numerator, int denominator) { - assert(numerator < (1 << 16)); - return (numerator << 16) / denominator; -}*/ - -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; -} - -void GLTexture::initGLExtensions() { - - // Return if extensions were already checked - if (glext_inited) - return; - - // Get a string with all extensions - const char *ext_string = (const char *)glGetString(GL_EXTENSIONS); - CHECK_GL_ERROR(); - Common::StringTokenizer tokenizer(ext_string, " "); - // Iterate all string tokens - while (!tokenizer.empty()) { - Common::String token = tokenizer.nextToken(); - if (token == "GL_ARB_texture_non_power_of_two") - npot_supported = true; - } - - glext_inited = true; -} - -GLTexture::GLTexture(byte bpp, GLenum internalFormat, GLenum format, GLenum type) - : - _bytesPerPixel(bpp), - _internalFormat(internalFormat), - _glFormat(format), - _glType(type), - _textureWidth(0), - _textureHeight(0), - _realWidth(0), - _realHeight(0), - _refresh(false), - _filter(GL_NEAREST) { - - // Generate the texture ID - glGenTextures(1, &_textureName); CHECK_GL_ERROR(); -} - -GLTexture::~GLTexture() { - // Delete the texture - glDeleteTextures(1, &_textureName); CHECK_GL_ERROR(); -} - -void GLTexture::refresh() { - // Delete previous texture - glDeleteTextures(1, &_textureName); CHECK_GL_ERROR(); - - // Generate the texture ID - glGenTextures(1, &_textureName); CHECK_GL_ERROR(); - _refresh = true; -} - -void GLTexture::allocBuffer(GLuint w, GLuint h) { - _realWidth = w; - _realHeight = h; - - if (!_refresh) { - if (npot_supported && _filter == GL_LINEAR) { - // Check if we already allocated a correctly-sized buffer - // This is so we don't need to duplicate the last row/column - if (w == _textureWidth && h == _textureHeight) - return; - } else { - // Check if we already have a large enough buffer - if (w <= _textureWidth && h <= _textureHeight) - return; - } - } - - if (npot_supported) { - _textureWidth = w; - _textureHeight = h; - } else { - _textureWidth = nextHigher2(w); - _textureHeight = nextHigher2(h); - } - - // Select this OpenGL texture - glBindTexture(GL_TEXTURE_2D, _textureName); CHECK_GL_ERROR(); - - // Set the texture parameters - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, _filter); CHECK_GL_ERROR(); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, _filter); CHECK_GL_ERROR(); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); CHECK_GL_ERROR(); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); CHECK_GL_ERROR(); - - // Allocate room for the texture - glTexImage2D(GL_TEXTURE_2D, 0, _internalFormat, - _textureWidth, _textureHeight, 0, _glFormat, _glType, NULL); CHECK_GL_ERROR(); - - _refresh = false; -} - -void GLTexture::updateBuffer(const void *buf, int pitch, GLuint x, GLuint y, GLuint w, GLuint h) { - // Skip empty updates. - if (w * h == 0) - return; - - // Select this OpenGL texture - glBindTexture(GL_TEXTURE_2D, _textureName); CHECK_GL_ERROR(); - - // Check if the buffer has its data contiguously - if ((int)w * _bytesPerPixel == pitch) { - glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, w, h, - _glFormat, _glType, buf); CHECK_GL_ERROR(); - } else { - // Update the texture row by row - const byte *src = (const byte *)buf; - GLuint curY = y; - GLuint height = h; - do { - glTexSubImage2D(GL_TEXTURE_2D, 0, x, curY, - w, 1, _glFormat, _glType, src); CHECK_GL_ERROR(); - curY++; - src += pitch; - } while (--height); - } - - // If we're in linear filter mode, repeat the last row/column if the real dimensions - // doesn't match the texture dimensions. - if (_filter == GL_LINEAR) { - if (_realWidth != _textureWidth && x + w == _realWidth) { - const byte *src = (const byte *)buf + (w - 1) * _bytesPerPixel; - GLuint curY = y; - GLuint height = h; - - do { - glTexSubImage2D(GL_TEXTURE_2D, 0, x + w, - curY, 1, 1, _glFormat, _glType, src); CHECK_GL_ERROR(); - - curY++; - src += pitch; - } while (--height); - } - - if (_realHeight != _textureHeight && y + h == _realHeight) { - glTexSubImage2D(GL_TEXTURE_2D, 0, x, y + h, - w, 1, _glFormat, _glType, (const byte *)buf + pitch * (h - 1)); CHECK_GL_ERROR(); - } - } -} - -void GLTexture::drawTexture(GLshort x, GLshort y, GLshort w, GLshort h) { - // Select this OpenGL texture - glBindTexture(GL_TEXTURE_2D, _textureName); CHECK_GL_ERROR(); - - // Calculate the texture rect that will be drawn - const GLfloat texWidth = (GLfloat)_realWidth / _textureWidth;//xdiv(_surface.w, _textureWidth); - const GLfloat texHeight = (GLfloat)_realHeight / _textureHeight;//xdiv(_surface.h, _textureHeight); - const GLfloat texcoords[] = { - 0, 0, - texWidth, 0, - 0, texHeight, - texWidth, texHeight, - }; - glTexCoordPointer(2, GL_FLOAT, 0, texcoords); CHECK_GL_ERROR(); - - // Calculate the screen rect where the texture will be drawn - const GLshort vertices[] = { - x, y, - (GLshort)(x + w), y, - x, (GLshort)(y + h), - (GLshort)(x + w), (GLshort)(y + h), - }; - glVertexPointer(2, GL_SHORT, 0, vertices); CHECK_GL_ERROR(); - - // Draw the texture to the screen buffer - glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); CHECK_GL_ERROR(); -} - -#endif |