Created attachment 54188 [details] Screenshot The flames from the ship in the game CoreBreach does not render correctly on i965. This bug is affects both 7.11 and git master. CoreBreach is so far only available as beta for Linux: http://corebreach.corecode.at/CoreBreach-1.1-beta4-linux32.tar.bz2 http://corebreach.corecode.at/CoreBreach-1.1-beta4-linux64.tar.bz2 System environment: -- chipset: G45 / ICH10R -- system architecture: 32-bit -- Linux distribution: Debian unstable -- Machine or mobo model: Asus P5Q-EM -- Display connector: DVI -- xf86-video-intel: 2.17.0 -- xserver: 1.11.1.902 -- mesa: -- drm: 2.4.27 -- kernel: 3.1.1
FYI the "flame" is a normal point sprite particle system with alpha blended particles, except that it uses the GL_CONSTANT_COLOR_EXT extension, maybe thats the source of the problem glEnable(GL_BLEND); glBlendColor(0.99, 0.94, 0.97, 0.4); glBlendFunc(GL_SRC_ALPHA, GL_CONSTANT_COLOR_EXT); glEnable(GL_POINT_SPRITE); glDrawArrays(GL_POINTS, 0, particleCount); the fragment shader is very simple: uniform float intensity; uniform sampler2D pointspriteTexture; void main() { gl_FragColor = texture2D(pointspriteTexture, gl_PointCoord); gl_FragColor.w *= intensity; }
This should be fixed as of: commit 43af02ac731dac7d80f7e47feb0c80e4da156769 Author: Yuanhan Liu <yuanhan.liu@linux.intel.com> Date: Mon Feb 27 15:46:32 2012 +0800 i965: handle gl_PointCoord for Gen4 and Gen5 platforms
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