From 135da0b9b7604d3348bf6955f4dae35211dd307c Mon Sep 17 00:00:00 2001 From: Thorbjørn Lindeijer Date: Sun, 11 Sep 2011 20:25:36 +0800 Subject: Fixed OpenGLGraphics::drawRescaledImagePattern This fixes overlay effects that are meant to scale with screen resolution. The problem was that the texture coordinates were not calculated correctly. They were adjusted to the scaled size of the image, and when scaling both the vertex and the texture coordinates, the image will simply not appear scaled at all. Now the texture coordinates are calculated based on the visible part of the original texture. There was also a problem with the vertex coordinates, which were not taking into account the visible part of the image. TMW-Mantis-issue: 1047 --- src/openglgraphics.cpp | 77 +++++++++++++++++++++++++++++--------------------- 1 file changed, 45 insertions(+), 32 deletions(-) (limited to 'src/openglgraphics.cpp') diff --git a/src/openglgraphics.cpp b/src/openglgraphics.cpp index c24b7d64..84f499a4 100644 --- a/src/openglgraphics.cpp +++ b/src/openglgraphics.cpp @@ -478,24 +478,26 @@ void OpenGLGraphics::drawImagePattern(Image *image, int x, int y, int w, int h) static_cast(mColor.a)); } -void OpenGLGraphics::drawRescaledImagePattern(Image *image, int x, int y, - int w, int h, int scaledWidth, +void OpenGLGraphics::drawRescaledImagePattern(Image *image, + int x, int y, + int w, int h, + int scaledWidth, int scaledHeight) { if (!image) return; + if (scaledWidth == 0 || scaledHeight == 0) + return; + const int srcX = image->mBounds.x; const int srcY = image->mBounds.y; - const int iw = scaledWidth; - const int ih = scaledHeight; + const int iw = image->getWidth(); + const int ih = image->getHeight(); if (iw == 0 || ih == 0) return; - const float tw = static_cast(image->getTextureWidth()); - const float th = static_cast(image->getTextureHeight()); - glColor4f(1.0f, 1.0f, 1.0f, image->mAlpha); bindTexture(Image::mTextureType, image->mGLImage); @@ -505,23 +507,31 @@ void OpenGLGraphics::drawRescaledImagePattern(Image *image, int x, int y, unsigned int vp = 0; const unsigned int vLimit = vertexBufSize * 4; - float texX1 = static_cast(srcX) / tw; - float texY1 = static_cast(srcY) / th; - // Draw a set of textured rectangles if (image->getTextureType() == GL_TEXTURE_2D) { - for (int py = 0; py < h; py += ih) + const float tw = static_cast(image->getTextureWidth()); + const float th = static_cast(image->getTextureHeight()); + + const float texX1 = static_cast(srcX) / tw; + const float texY1 = static_cast(srcY) / th; + + const float tFractionW = iw / tw; + const float tFractionH = ih / th; + + for (int py = 0; py < h; py += scaledHeight) { - const int height = (py + ih >= h) ? h - py : ih; + const int height = (py + scaledHeight >= h) ? h - py : scaledHeight; const int dstY = y + py; - for (int px = 0; px < w; px += iw) + for (int px = 0; px < w; px += scaledWidth) { - int width = (px + iw >= w) ? w - px : iw; + int width = (px + scaledWidth >= w) ? w - px : scaledWidth; int dstX = x + px; + const float visibleFractionW = (float) width / scaledWidth; + const float visibleFractionH = (float) height / scaledHeight; - float texX2 = static_cast(srcX + width) / tw; - float texY2 = static_cast(srcY + height) / th; + const float texX2 = texX1 + tFractionW * visibleFractionW; + const float texY2 = texY1 + tFractionH * visibleFractionH; mFloatTexArray[vp + 0] = texX1; mFloatTexArray[vp + 1] = texY1; @@ -538,14 +548,14 @@ void OpenGLGraphics::drawRescaledImagePattern(Image *image, int x, int y, mIntVertArray[vp + 0] = dstX; mIntVertArray[vp + 1] = dstY; - mIntVertArray[vp + 2] = dstX + scaledWidth; + mIntVertArray[vp + 2] = dstX + width; mIntVertArray[vp + 3] = dstY; - mIntVertArray[vp + 4] = dstX + scaledWidth; - mIntVertArray[vp + 5] = dstY + scaledHeight; + mIntVertArray[vp + 4] = dstX + width; + mIntVertArray[vp + 5] = dstY + height; mIntVertArray[vp + 6] = dstX; - mIntVertArray[vp + 7] = dstY + scaledHeight; + mIntVertArray[vp + 7] = dstY + height; vp += 8; if (vp >= vLimit) @@ -560,38 +570,41 @@ void OpenGLGraphics::drawRescaledImagePattern(Image *image, int x, int y, } else { - for (int py = 0; py < h; py += ih) + const float scaleFactorW = (float) scaledWidth / iw; + const float scaleFactorH = (float) scaledHeight / ih; + + for (int py = 0; py < h; py += scaledHeight) { - const int height = (py + ih >= h) ? h - py : ih; + const int height = (py + scaledHeight >= h) ? h - py : scaledHeight; const int dstY = y + py; - for (int px = 0; px < w; px += iw) + for (int px = 0; px < w; px += scaledWidth) { - int width = (px + iw >= w) ? w - px : iw; + int width = (px + scaledWidth >= w) ? w - px : scaledWidth; int dstX = x + px; mIntTexArray[vp + 0] = srcX; mIntTexArray[vp + 1] = srcY; - mIntTexArray[vp + 2] = srcX + width; + mIntTexArray[vp + 2] = srcX + width / scaleFactorW; mIntTexArray[vp + 3] = srcY; - mIntTexArray[vp + 4] = srcX + width; - mIntTexArray[vp + 5] = srcY + height; + mIntTexArray[vp + 4] = srcX + width / scaleFactorW; + mIntTexArray[vp + 5] = srcY + height / scaleFactorH; mIntTexArray[vp + 6] = srcX; - mIntTexArray[vp + 7] = srcY + height; + mIntTexArray[vp + 7] = srcY + height / scaleFactorH; mIntVertArray[vp + 0] = dstX; mIntVertArray[vp + 1] = dstY; - mIntVertArray[vp + 2] = dstX + scaledWidth; + mIntVertArray[vp + 2] = dstX + width; mIntVertArray[vp + 3] = dstY; - mIntVertArray[vp + 4] = dstX + scaledWidth; - mIntVertArray[vp + 5] = dstY + scaledHeight; + mIntVertArray[vp + 4] = dstX + width; + mIntVertArray[vp + 5] = dstY + height; mIntVertArray[vp + 6] = dstX; - mIntVertArray[vp + 7] = dstY + scaledHeight; + mIntVertArray[vp + 7] = dstY + height; vp += 8; if (vp >= vLimit) -- cgit v1.2.3-70-g09d2