sorry, i don't have any answer : i did not spend much time working with geometry shader. I'll have to find a good documentation first!

Cyrille

Jack a écrit :

Le lundi 22 mars 2010 à 21:19 +0100, cyrille henry a écrit :

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Jack a écrit :

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Hello,

I am working on this small patch and would like to repeat a geo (square) several times but i am limited to 42 times. Do you know why ?

it's strange, but i have the same limitation. 42 is the answer. ;-)

OK :) It seems this number depends if i pass the varying variable gl_Color to the fragment shader, right ? Because i can draw my square 85 times without this variable in the fragment shader (gl_FragColor=vec4(1.0,1.0,1.0,1.0) instead of gl_FragColor=gl_Color). But what else ? How can i determine this value (42 or 85) with the specifications of my GPU ?

I thought it would be possible to use shader to draw much more geos with this method (with an equation in this shader), but i was wrong. So i have to draw a 'curve' with vertices (with something like [polygon] or with [GEMglVertex3f]) and then apply a geometry shader ? This is not very easy if i have 100 vertices to define ! :) I hope that i miss something. I will dig tomorrow. Thanx. ++

Jack

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C

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Here some infos :

[glsl_geometry]: geometry_shader Hardware Info [glsl_geometry]: ============================ [glsl_geometry]: MAX_GEOMETRY_UNIFORM_COMPONENTS_EXT: 2048 [glsl_geometry]: MAX_VARYING_FLOATS: 60 [glsl_geometry]: MAX_COMBINED_TEXTURE_IMAGE_UNITS: 32 [glsl_geometry]: MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_EXT: 32 [glsl_geometry]: MAX_TEXTURE_IMAGE_UNITS: 32 [glsl_geometry]: MAX_TEXTURE_COORDS: 8 [glsl_vertex]: Vertex_shader Hardware Info [glsl_vertex]: ============================ [glsl_vertex]: MAX_VERTEX_ATTRIBS: 16 [glsl_vertex]: MAX_VERTEX_UNIFORM_COMPONENTS_ARB: 4096 [glsl_vertex]: MAX_VARYING_FLOATS: 60 [glsl_vertex]: MAX_COMBINED_TEXTURE_IMAGE_UNITS: 32 [glsl_vertex]: MAX_VERTEX_TEXTURE_IMAGE_UNITS: 32 [glsl_vertex]: MAX_TEXTURE_IMAGE_UNITS: 32 [glsl_vertex]: MAX_TEXTURE_COORDS: 8 [glsl_fragment]: glsl_fragment Hardware Info [glsl_fragment]: ============================ [glsl_fragment]: MAX_FRAGMENT_UNIFORM_COMPONENTS: 2048 [glsl_fragment]: MAX_TEXTURE_COORDS: 8 [glsl_fragment]: MAX_TEXTURE_IMAGE_UNITS: 32

Thanx. ++

Jack

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