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authorThorbjørn Lindeijer <thorbjorn@lindeijer.nl>2011-09-11 14:25:36 +0200
committerAndrei Karas <akaras@inbox.ru>2011-09-11 19:55:35 +0300
commit8f0a7cbb675ede13658bcc10b045d46fda9c93da (patch)
tree80b648bb7fc60f20abc4f0be3731c6388fea015a
parentc6a0486425aafdf766105da53e4304b42a417498 (diff)
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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 Reviewed-by: Andrei Karas <akaras@inbox.ru> Conflicts: NEWS
-rw-r--r--src/openglgraphics.cpp77
1 files changed, 45 insertions, 32 deletions
diff --git a/src/openglgraphics.cpp b/src/openglgraphics.cpp
index 046c5fd30..332f79823 100644
--- a/src/openglgraphics.cpp
+++ b/src/openglgraphics.cpp
@@ -486,24 +486,26 @@ void OpenGLGraphics::drawImagePattern(Image *image, int x, int y, int w, int h)
static_cast<GLubyte>(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<float>(image->getTextureWidth());
- const float th = static_cast<float>(image->getTextureHeight());
-
glColor4f(1.0f, 1.0f, 1.0f, image->mAlpha);
bindTexture(Image::mTextureType, image->mGLImage);
@@ -513,23 +515,31 @@ void OpenGLGraphics::drawRescaledImagePattern(Image *image, int x, int y,
unsigned int vp = 0;
const unsigned int vLimit = vertexBufSize * 4;
- float texX1 = static_cast<float>(srcX) / tw;
- float texY1 = static_cast<float>(srcY) / th;
-
// Draw a set of textured rectangles
if (image->mTextureType == GL_TEXTURE_2D)
{
- for (int py = 0; py < h; py += ih)
+ const float tw = static_cast<float>(image->getTextureWidth());
+ const float th = static_cast<float>(image->getTextureHeight());
+
+ const float texX1 = static_cast<float>(srcX) / tw;
+ const float texY1 = static_cast<float>(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<float>(srcX + width) / tw;
- float texY2 = static_cast<float>(srcY + height) / th;
+ const float texX2 = texX1 + tFractionW * visibleFractionW;
+ const float texY2 = texY1 + tFractionH * visibleFractionH;
mFloatTexArray[vp + 0] = texX1;
mFloatTexArray[vp + 1] = texY1;
@@ -546,14 +556,14 @@ 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)
@@ -568,38 +578,41 @@ 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)