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Fix RenderTexture texture size + add text/font debug output

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- Add Texture::setSize() method for RenderTexture to set its texture dimensions
- RenderTexture::create() now sets texture size (was 0,0 causing Sprite::draw to bail)
- Add debug output to FontAtlas::load showing glyph count and non-zero pixels
- Add debug output to Text::draw showing atlas texture ID and colors

These fixes should enable grid rendering (RenderTexture now has proper size).
Debug output will help diagnose why text shows as solid boxes instead of glyphs.

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
John McCardle 2026-01-31 12:52:35 -05:00
commit 50b63a8d06
2 changed files with 22 additions and 0 deletions
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21
src/platform/SDL2Renderer.cpp
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@ -1021,6 +1021,7 @@ bool RenderTexture::create(unsigned int width, unsigned int height) {
// Set up internal texture to point to FBO color attachment
texture_.setNativeHandle(colorTexture);
texture_.setSize(width, height); // Critical: Sprite::draw needs texture size for UV calc
view_ = View(FloatRect(0, 0, static_cast<float>(width), static_cast<float>(height)));
defaultView_ = view_;
@ -1575,6 +1576,8 @@ void Sprite::draw(RenderTarget& target, RenderStates states) const {
// Static cache for font atlases - keyed by (font data pointer, character size)
static std::map<std::pair<const Font*, unsigned int>, FontAtlas> s_fontAtlasCache;
static int textDebugCount = 0;
void Text::draw(RenderTarget& target, RenderStates states) const {
if (!font_ || string_.empty() || !font_->isLoaded()) return;
@ -1584,12 +1587,21 @@ void Text::draw(RenderTarget& target, RenderStates states) const {
if (it == s_fontAtlasCache.end()) {
FontAtlas atlas;
if (!atlas.load(font_->getData(), font_->getDataSize(), static_cast<float>(characterSize_))) {
std::cerr << "Text::draw: Failed to create font atlas!" << std::endl;
return; // Failed to create atlas
}
std::cout << "Text::draw: Created font atlas, textureId=" << atlas.getTextureId() << std::endl;
it = s_fontAtlasCache.emplace(key, std::move(atlas)).first;
}
const FontAtlas& atlas = it->second;
// Debug: log first few text draws
if (textDebugCount < 3) {
std::cout << "Text::draw: string='" << string_.substr(0, 20) << "' atlasTexId=" << atlas.getTextureId()
<< " fillColor=(" << (int)fillColor_.r << "," << (int)fillColor_.g << "," << (int)fillColor_.b << ")" << std::endl;
textDebugCount++;
}
Transform combined = states.transform * getTransform();
// Build vertex data for all glyphs
@ -1904,6 +1916,15 @@ bool FontAtlas::load(const unsigned char* fontData, size_t dataSize, float fontS
textureId_ = SDL2Renderer::getInstance().createTexture(atlasSize, atlasSize, rgbaPixels.data());
// Debug: Check if any glyph pixels were actually rendered
int nonZeroPixels = 0;
for (int i = 0; i < atlasSize * atlasSize; ++i) {
if (atlasPixels[i] > 0) nonZeroPixels++;
}
std::cout << "FontAtlas: created " << atlasSize << "x" << atlasSize
<< " atlas with " << glyphCache_.size() << " glyphs, "
<< nonZeroPixels << " non-zero pixels, textureId=" << textureId_ << std::endl;
return true;
}