diff options
Diffstat (limited to 'src/library_gl.js')
| -rw-r--r-- | src/library_gl.js | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/library_gl.js b/src/library_gl.js index 87c47421..21d71878 100644 --- a/src/library_gl.js +++ b/src/library_gl.js @@ -1891,9 +1891,14 @@ var LibraryGL = { } } else if (GL.immediate.mode > 6) { // above GL_TRIANGLE_FAN are the non-GL ES modes if (GL.immediate.mode != 7) throw 'unsupported immediate mode ' + GL.immediate.mode; // GL_QUADS + // GL.immediate.firstVertex is the first vertex we want. Quad indexes are in the pattern + // 0 1 2, 0 2 3, 4 5 6, 4 6 7, so we need to look at index firstVertex * 1.5 to see it. + // Then since indexes are 2 bytes each, that means 3 + assert(GL.immediate.firstVertex % 4 == 0); + ptr = GL.immediate.firstVertex*3; var numQuads = numVertexes / 4; - var numIndexes = numQuads * 6; // 0 1 2, 0 2 3 pattern - assert(numIndexes << 1 <= GL.immediate.MAX_TEMP_BUFFER_SIZE, 'too many immediate mode indexes (b)'); + numIndexes = numQuads * 6; // 0 1 2, 0 2 3 pattern + assert(ptr + (numIndexes << 1) <= GL.immediate.MAX_TEMP_BUFFER_SIZE, 'too many immediate mode indexes (b)'); Module.ctx.bindBuffer(Module.ctx.ELEMENT_ARRAY_BUFFER, this.tempQuadIndexBuffer); emulatedElementArrayBuffer = true; } |