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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/Image.cpp
+12 -7
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@@ -93,26 +93,31 @@ Image::~Image()
void Image::preload()
{
// For colors.
memset(vertices, 255, sizeof(Vertex)*4);
for (int i = 0; i < 4; i++)
vertices[i].r = vertices[i].g = vertices[i].b = vertices[i].a = 255;
// Vertices are ordered for use with triangle strips:
// 0----2
// | / |
// | / |
// 1----3
vertices[0].x = 0.0f;
vertices[0].y = 0.0f;
vertices[1].x = 0.0f;
vertices[1].y = (float) height;
vertices[2].x = (float) width;
vertices[2].y = (float) height;
vertices[2].y = 0.0f;
vertices[3].x = (float) width;
vertices[3].y = 0.0f;
vertices[3].y = (float) height;
vertices[0].s = 0.0f;
vertices[0].t = 0.0f;
vertices[1].s = 0.0f;
vertices[1].t = 1.0f;
vertices[2].s = 1.0f;
vertices[2].t = 1.0f;
vertices[2].t = 0.0f;
vertices[3].s = 1.0f;
vertices[3].t = 0.0f;
vertices[3].t = 1.0f;
if (flags.mipmaps)
filter.mipmap = defaultMipmapFilter;
@@ -362,7 +367,7 @@ void Image::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);