protected internal virtual void drawArraysTriangleFan(int first, int count)
{
Memory mem = Memory.Instance;
CachedTextureResampled cachedTexture = CachedTexture;
TriangleRenderer triangleRenderer = new TriangleRenderer(context, cachedTexture, useVertexTexture);
VertexState tv1 = null;
VertexState tv2 = null;
VertexState tv3 = v1;
bool readTexture = context.textureFlag.Enabled && !context.clearMode;
for (int i = 0; i < count; i++)
{
readVertex(mem, first + i, tv3, readTexture);
if (tv2 != null)
{
drawTriangle(triangleRenderer, tv1, tv2, tv3, false);
VertexState v = tv2;
tv2 = tv3;
tv3 = v;
}
else if (tv1 == null)
{
tv1 = tv3;
tv3 = v2;
}
else
{
tv2 = tv3;
tv3 = v3;
}
}
}
protected internal virtual void drawTriangle(TriangleRenderer triangleRenderer, VertexState v1, VertexState v2, VertexState v3, bool invertedFrontFace)
{
triangleRenderer.setVertex(v1, v2, v3);
if (!triangleRenderer.isCulled(invertedFrontFace))
{
render(triangleRenderer);
}
}
protected internal virtual void drawArraysTriangles(int first, int count)
{
Memory mem = Memory.Instance;
CachedTextureResampled cachedTexture = CachedTexture;
TriangleRenderer triangleRenderer = new TriangleRenderer(context, cachedTexture, useVertexTexture);
bool readTexture = context.textureFlag.Enabled && !context.clearMode;
for (int i = 0; i < count; i += 3)
{
readVertex(mem, first + i, v1, readTexture);
readVertex(mem, first + i + 1, v2, readTexture);
readVertex(mem, first + i + 2, v3, readTexture);
drawTriangle(triangleRenderer, v1, v2, v3, false);
}
}
protected internal virtual void drawArraysTriangleStrips(int first, int count)
{
Memory mem = Memory.Instance;
CachedTextureResampled cachedTexture = CachedTexture;
TriangleRenderer triangleRenderer = new TriangleRenderer(context, cachedTexture, useVertexTexture);
SpriteRenderer spriteRenderer = null;
VertexState tv1 = null;
VertexState tv2 = null;
VertexState tv3 = null;
VertexState tv4 = v1;
bool readTexture = context.textureFlag.Enabled && !context.clearMode;
for (int i = 0; i < count; i++)
{
readVertex(mem, first + i, tv4, readTexture);
if (tv3 != null)
{
// Displaying a sprite (i.e. rectangular area) is faster.
// Try to merge adjacent triangles if they form a sprite.
if (isSprite(context.vinfo, tv1, tv2, tv3, tv4))
{
if (spriteRenderer == null)
{
spriteRenderer = new SpriteRenderer(context, cachedTexture, useVertexTexture);
}
drawSprite(spriteRenderer, tv1, tv4);
v5.copy(tv3);
v6.copy(tv4);
v1.copy(v5);
v2.copy(v6);
tv1 = v1;
tv2 = v2;
tv3 = null;
tv4 = v3;
}
else
{
// The Front face direction is inverted every 2 triangles in the strip.
drawTriangle(triangleRenderer, tv1, tv2, tv3, ((i - 3) & 1) != 0);
VertexState v = tv1;
tv1 = tv2;
tv2 = tv3;
tv3 = tv4;
tv4 = v;
}
}
else if (tv1 == null)
{
tv1 = tv4;
tv4 = v2;
}
else if (tv2 == null)
{
tv2 = tv4;
tv4 = v3;
}
else
{
tv3 = tv4;
tv4 = v4;
}
}
if (tv3 != null)
{
// The Front face direction is inverted every 2 triangles in the strip.
drawTriangle(triangleRenderer, tv1, tv2, tv3, (count & 1) == 0);
}
}