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Vertex shaders can write to gl_PointSize (fixes #1603).

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If a shader uses gl_PointSize then it can only be used when drawing points. If a shader doesn't use gl_PointSize then it can't be used when drawing points.

Added 'ConstantPointSize' and 'CurrentDPIScale' built-in shader uniforms.

ConstantPointSize is in DPI-scaled points, whereas gl_PointSize is in pixels, so to get the correct default behaviour a shader needs to do gl_PointSize = ConstantPointSize * CurrentDPIScale
This commit is contained in:
Alex Szpakowski
2021-01-23 13:47:12 -04:00
parent deff795908
commit 694d448e83
13 changed files with 83 additions and 87 deletions
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src/modules/graphics/opengl/Graphics.cpp
+4 -2
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@@ -304,6 +304,9 @@ bool Graphics::setMode(int width, int height, int pixelwidth, int pixelheight, b
glEnable(GL_TEXTURE_2D);
}
if (!GLAD_ES_VERSION_2_0)
glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
gl.setTextureUnit(0);
// Set pixel row alignment - code that calls glTexSubImage and glReadPixels
@@ -1444,10 +1447,9 @@ void Graphics::setBlendState(const BlendState &blend)
void Graphics::setPointSize(float size)
{
if (batchedDrawState.primitiveMode == PRIMITIVE_POINTS)
if (size != states.back().pointSize)
flushBatchedDraws();
gl.setPointSize(size * getCurrentDPIScale());
states.back().pointSize = size;
}