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309 lines
8.9 KiB
309 lines
8.9 KiB
/* The MIT License
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*
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* Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "graphics.h"
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#include "logger.h"
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#include "texture.h"
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <GL/glext.h>
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Graphics g_graphics;
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void Graphics::init()
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{
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// setup opengl
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glEnable(GL_ALPHA_TEST); // enable alpha by default
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glAlphaFunc(GL_GREATER, 0.0f); // default alpha mode
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glDisable(GL_DEPTH_TEST); // we are rendering 2D only, we don't need it
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glEnable(GL_TEXTURE_2D); // enable textures by default
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glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
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glShadeModel(GL_SMOOTH);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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logInfo("GPU %s", (const char*)glGetString(GL_RENDERER));
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logInfo("OpenGL %s", (const char*)glGetString(GL_VERSION));
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}
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void Graphics::terminate()
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{
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}
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bool Graphics::isExtensionSupported(const char *extension)
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{
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const GLubyte *extensions = NULL;
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const GLubyte *start;
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GLubyte *where, *terminator;
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where = (GLubyte *)strchr(extension, ' ');
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if(where || *extension == '\0')
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return 0;
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extensions = glGetString(GL_EXTENSIONS);
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start = extensions;
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while(true) {
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where = (GLubyte *) strstr((const char *)start, extension);
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if(!where)
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break;
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terminator = where + strlen(extension);
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if(where == start || *(where - 1) == ' ')
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if(*terminator == ' ' || *terminator == '\0')
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return 1;
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start = terminator;
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}
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return 0;
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}
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void Graphics::resize(const Size& size)
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{
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m_screenSize = size;
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restoreViewport();
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}
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void Graphics::restoreViewport()
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{
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const int& width = m_screenSize.width();
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const int& height = m_screenSize.height();
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// resize gl viewport
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glViewport(0, 0, width, height);
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/*
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0,0---------0,w
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h,0---------h,w
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*/
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// setup view region like above
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluOrtho2D(0.0f, width, height, 0.0f);
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// back to model view
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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void Graphics::beginRender()
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{
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glLoadIdentity();
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}
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void Graphics::endRender()
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{
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}
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void Graphics::setColor(const Color& color)
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{
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glColor4ubv(color.rgbaPtr());
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}
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void Graphics::resetColor()
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{
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glColor4ub(0xFF, 0xFF, 0xFF, 0xFF);
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}
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void Graphics::_beginTextureRender(const Texture *texture)
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{
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glBindTexture(GL_TEXTURE_2D, texture->getTextureId());
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glBegin(GL_QUADS);
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}
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void Graphics::_endTextureRender()
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{
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glEnd();
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}
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void Graphics::drawTexturedRect(const Rect& screenCoords, const Texture *texture, const Rect& textureCoords)
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{
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if(screenCoords.size().isEmpty())
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return;
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glBindTexture(GL_TEXTURE_2D, texture->getTextureId());
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glBegin(GL_QUADS);
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_drawTexturedRect(screenCoords, textureCoords, texture->getSize());
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glEnd();
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}
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void Graphics::_drawTexturedRect(const Rect& screenCoords, const Rect& textureCoords, const Size& textureSize)
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{
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if(screenCoords.size().isEmpty())
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return;
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// rect correction for opengl
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int right = screenCoords.right() + 1;
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int bottom = screenCoords.bottom() + 1;
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int top = screenCoords.top();
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int left = screenCoords.left();
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float textureRight = 0.0f;
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float textureBottom = 1.0f;
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float textureTop = 0.0f;
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float textureLeft = 1.0f;
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if(!textureCoords.isEmpty()) {
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textureRight = (float)(textureCoords.right() + 1) / textureSize.width();
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textureBottom = (float)(textureCoords.bottom() + 1) / textureSize.height();
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textureTop = (float)textureCoords.top() / textureSize.height();
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textureLeft = (float)textureCoords.left() / textureSize.width();
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}
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glTexCoord2f(textureLeft, textureTop); glVertex2i(left, top);
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glTexCoord2f(textureLeft, textureBottom); glVertex2i(left, bottom);
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glTexCoord2f(textureRight, textureBottom); glVertex2i(right, bottom);
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glTexCoord2f(textureRight, textureTop); glVertex2i(right, top);
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}
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void Graphics::drawRepeatedTexturedRect(const Rect& screenCoords, const Texture* texture, const Rect& texCoords)
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{
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if(screenCoords.size().isEmpty())
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return;
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glBindTexture(GL_TEXTURE_2D, texture->getTextureId());
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glBegin(GL_QUADS);
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_drawRepeatedTexturedRect(screenCoords, texCoords, texture->getSize());
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glEnd();
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}
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void Graphics::_drawRepeatedTexturedRect(const Rect& screenCoords, const Rect& textureCoords, const Size& textureSize)
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{
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if(screenCoords.size().isEmpty())
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return;
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// render many repeated texture rects
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Rect virtualScreenCoords(0,0,screenCoords.size());
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for(int y = 0; y <= virtualScreenCoords.height(); y += textureCoords.height()) {
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for(int x = 0; x <= virtualScreenCoords.width(); x += textureCoords.width()) {
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Rect partialCoords(x, y, textureCoords.size());
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Rect partialTextureCoords = textureCoords;
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// partialCoords to screenCoords bottomRight
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if(partialCoords.bottom() > virtualScreenCoords.bottom()) {
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partialTextureCoords.setBottom(partialTextureCoords.bottom() + (virtualScreenCoords.bottom() - partialCoords.bottom()));
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partialCoords.setBottom(virtualScreenCoords.bottom());
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}
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if(partialCoords.right() > virtualScreenCoords.right()) {
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partialTextureCoords.setRight(partialTextureCoords.right() + (virtualScreenCoords.right() - partialCoords.right()));
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partialCoords.setRight(virtualScreenCoords.right());
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}
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partialCoords.translate(screenCoords.topLeft());
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_drawTexturedRect(partialCoords, partialTextureCoords, textureSize);
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}
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}
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}
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void Graphics::drawColoredRect(const Rect& screenCoords, const Color& color)
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{
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if(screenCoords.size().isEmpty())
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return;
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glDisable(GL_TEXTURE_2D);
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setColor(color);
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// rect correction for opengl
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int right = screenCoords.right() + 1;
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int bottom = screenCoords.bottom() + 1;
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int top = screenCoords.top();
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int left = screenCoords.left();
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glBegin(GL_QUADS);
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glVertex2i(left, top);
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glVertex2i(left, bottom);
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glVertex2i(right, bottom);
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glVertex2i(right, top);
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glEnd();
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glEnable(GL_TEXTURE_2D);
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resetColor();
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}
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void Graphics::drawBoundingRect(const Rect& screenCoords, const Color& color, int innerLineWidth)
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{
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if(2 * innerLineWidth > screenCoords.height())
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return;
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glDisable(GL_TEXTURE_2D);
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setColor(color);
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// rect correction for opengl
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int right = screenCoords.right()+1;
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int bottom = screenCoords.bottom()+1;
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int top = screenCoords.top();
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int left = screenCoords.left();
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glBegin(GL_QUADS);
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// top line
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glVertex2i(left, top);
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glVertex2i(left, top + innerLineWidth);
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glVertex2i(right, top + innerLineWidth);
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glVertex2i(right, top);
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// left
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glVertex2i(left, screenCoords.top() + innerLineWidth);
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glVertex2i(left, bottom - innerLineWidth);
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glVertex2i(left + innerLineWidth, bottom - innerLineWidth);
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glVertex2i(left + innerLineWidth, screenCoords.top() + innerLineWidth);
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// bottom line
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glVertex2i(left, bottom);
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glVertex2i(left, bottom - innerLineWidth);
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glVertex2i(right, bottom - innerLineWidth);
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glVertex2i(right, bottom);
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// right line
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glVertex2i(right , top + innerLineWidth);
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glVertex2i(right , bottom - innerLineWidth);
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glVertex2i(right - innerLineWidth, bottom - innerLineWidth);
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glVertex2i(right - innerLineWidth, top + innerLineWidth);
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glEnd();
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glEnable(GL_TEXTURE_2D);
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resetColor();
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}
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void Graphics::_drawBoundingRect(const Rect& screenCoords, const Color& color, int innerLineWidth)
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{
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glEnd();
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drawBoundingRect(screenCoords, color, innerLineWidth);
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glBegin(GL_QUADS);
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}
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