diff options
Diffstat (limited to 'o3d/cg_to_glsl/convert.py')
| -rwxr-xr-x | o3d/cg_to_glsl/convert.py | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/o3d/cg_to_glsl/convert.py b/o3d/cg_to_glsl/convert.py index 8eb86ec..3efb3ea 100755 --- a/o3d/cg_to_glsl/convert.py +++ b/o3d/cg_to_glsl/convert.py @@ -18,7 +18,7 @@ import sys # # * changes 'uniform vecN var[N]' to 'uniform matN var'; # -# * renames gl_Vertex and gl_MultiTexCoordN to position and texcoordsN +# * renames gl_Vertex and gl_MultiTexCoordN to position and texcoordN # respectively and adds attribute declarations; # # * prints the results to standard output, separating them with SplitMarker @@ -77,14 +77,32 @@ def fix_glsl_body(body, input_mapping): for n in xrange(8): if 'gl_MultiTexCoord%d' % n in body: - # Change gl_MultiTexCoordN (0<=N<=7) to texcoordsN and add attribute + # Change gl_MultiTexCoordN (0<=N<=7) to texcoordN and add attribute # declaration. - body = re.sub(r'\bgl_MultiTexCoord%d\b' % n, 'texcoords%d' % n, body) - attributes.append('attribute vec4 texcoords%d;' % n) + body = re.sub(r'\bgl_MultiTexCoord%d\b' % n, 'texcoord%d' % n, body) + attributes.append('attribute vec4 texcoord%d;' % n) # ATTRIBUTES_TO_SEMANTICS should have taken care of normals. assert 'gl_Normal' not in body + if 'gl_Position' in body: + # If there is exactly one assignment to gl_Position, modify it similar to + # how RewriteVertexProgramSource in gl/effect_gl.cc does it. The input is + # taken from vec4 dx_clipping uniform. + # + # If there is more than one gl_Position mentioned in the shader, the + # converter fails. + assert len(re.findall('gl_Position', body)) == 1 + attributes.append('vec4 _glPositionTemp;') + attributes.append('uniform vec4 dx_clipping;') + body = re.sub(r'\bgl_Position\b([^;]*);', + r'_glPositionTemp\1; gl_Position = vec4(' + + r'_glPositionTemp.x + _glPositionTemp.w * dx_clipping.x, ' + + r'dx_clipping.w * ' + + r'(_glPositionTemp.y + _glPositionTemp.w * dx_clipping.y), ' + + r'_glPositionTemp.z * 2 - _glPositionTemp.w, ' + + r'_glPositionTemp.w);', body) + return '\n'.join(attributes) + '\n\n' + body |