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Use triangle strips rather than triangle fans when possible.

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--HG--
branch : minor
This commit is contained in:
Alex Szpakowski
2015-02-28 02:32:34 -04:00
parent 9313484fcc
commit faa4a33fe9
6 changed files with 46 additions and 23 deletions
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src/modules/graphics/opengl/Canvas.cpp
+10 -5
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@@ -110,15 +110,20 @@ Canvas::Canvas(int width, int height, Format format, int msaa)
float w = static_cast<float>(width);
float h = static_cast<float>(height);
// Vertices are ordered for use with triangle strips:
// 0----2
// | / |
// | / |
// 1----3
// world coordinates
vertices[0].x = 0;
vertices[0].y = 0;
vertices[1].x = 0;
vertices[1].y = h;
vertices[2].x = w;
vertices[2].y = h;
vertices[2].y = 0;
vertices[3].x = w;
vertices[3].y = 0;
vertices[3].y = h;
// texture coordinates
vertices[0].s = 0;
@@ -126,9 +131,9 @@ Canvas::Canvas(int width, int height, Format format, int msaa)
vertices[1].s = 0;
vertices[1].t = 1;
vertices[2].s = 1;
vertices[2].t = 1;
vertices[2].t = 0;
vertices[3].s = 1;
vertices[3].t = 0;
vertices[3].t = 1;
loadVolatile();
@@ -305,7 +310,7 @@ void Canvas::drawv(const Matrix &t, const Vertex *v)
glVertexAttribPointer(ATTRIB_TEXCOORD, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), &v[0].s);
gl.prepareDraw();
gl.drawArrays(GL_TRIANGLE_FAN, 0, 4);
gl.drawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableVertexAttribArray(ATTRIB_TEXCOORD);
glDisableVertexAttribArray(ATTRIB_POS);