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Make text overlays apply alpha to text as well as background

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This commit is contained in:
David Rowe 2014-11-11 17:54:02 -08:00
parent d9141b4010
commit 8ac3aba2bd
5 changed files with 12 additions and 9 deletions
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3
examples/overlaysExample.js
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@ -68,7 +68,8 @@ var text = Overlays.addOverlay("text", {
color: { red: 255, green: 0, blue: 0}, color: { red: 255, green: 0, blue: 0},
topMargin: 4, topMargin: 4,
leftMargin: 4, leftMargin: 4,
text: "Here is some text.\nAnd a second line." text: "Here is some text.\nAnd a second line.",
alpha: 0.7
}); });
// This will create an image overlay, which starts out as invisible // This will create an image overlay, which starts out as invisible

12
interface/src/ui/TextRenderer.cpp
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@ -69,14 +69,16 @@ int TextRenderer::calculateHeight(const char* str) {
return maxHeight; return maxHeight;
} }
int TextRenderer::draw(int x, int y, const char* str) { int TextRenderer::draw(int x, int y, const char* str, float alpha) {
// Grab the current color // Grab the current color
float currentColor[4]; float currentColor[4];
glGetFloatv(GL_CURRENT_COLOR, currentColor); glGetFloatv(GL_CURRENT_COLOR, currentColor);
int compactColor = ((int( currentColor[0] * 255.f) & 0xFF)) | alpha = std::max(0.f, std::min(alpha, 1.f));
((int( currentColor[1] * 255.f) & 0xFF) << 8) | currentColor[3] *= alpha;
((int( currentColor[2] * 255.f) & 0xFF) << 16) | int compactColor = ((int(currentColor[0] * 255.f) & 0xFF)) |
((int( currentColor[3] * 255.f) & 0xFF) << 24); ((int(currentColor[1] * 255.f) & 0xFF) << 8) |
((int(currentColor[2] * 255.f) & 0xFF) << 16) |
((int(currentColor[3] * 255.f) & 0xFF) << 24);
// TODO: Remove that code once we test for performance improvments // TODO: Remove that code once we test for performance improvments
//glEnable(GL_TEXTURE_2D); //glEnable(GL_TEXTURE_2D);

2
interface/src/ui/TextRenderer.h
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@ -63,7 +63,7 @@ public:
int calculateHeight(const char* str); int calculateHeight(const char* str);
// also returns the height of the tallest character // also returns the height of the tallest character
int draw(int x, int y, const char* str); int draw(int x, int y, const char* str, float alpha = 1.f);
int computeWidth(char ch); int computeWidth(char ch);
int computeWidth(const char* str); int computeWidth(const char* str);

2
interface/src/ui/overlays/Text3DOverlay.cpp
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@ -112,7 +112,7 @@ void Text3DOverlay::render(RenderArgs* args) {
QStringList lines = _text.split("\n"); QStringList lines = _text.split("\n");
int lineOffset = maxHeight; int lineOffset = maxHeight;
foreach(QString thisLine, lines) { foreach(QString thisLine, lines) {
textRenderer->draw(0, lineOffset, qPrintable(thisLine)); textRenderer->draw(0, lineOffset, qPrintable(thisLine), alpha);
lineOffset += maxHeight; lineOffset += maxHeight;
} }

2
interface/src/ui/overlays/TextOverlay.cpp
View file

@ -82,7 +82,7 @@ void TextOverlay::render(RenderArgs* args) {
if (lineOffset == 0) { if (lineOffset == 0) {
lineOffset = textRenderer->calculateHeight(qPrintable(thisLine)); lineOffset = textRenderer->calculateHeight(qPrintable(thisLine));
} }
lineOffset += textRenderer->draw(x, y + lineOffset, qPrintable(thisLine)); lineOffset += textRenderer->draw(x, y + lineOffset, qPrintable(thisLine), alpha);
const int lineGap = 2; const int lineGap = 2;
lineOffset += lineGap; lineOffset += lineGap;