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32e97315
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2011-08-24T01:03:11
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Emulate certain buil-in functions to work around driver bugs.
This is implemented by adding a new compile option SH_EMULATE_BUILT_IN_FUNCTIONS. The emulated functions are names as webgl_originalName_emu so there will never be naming conflicts.
At the moment only three functions are emulated: normalize, abs, sign. Also, the compile option will emulate all three. However, the mechanism to emulate only a selected subset is also imeplemented. It can be turned on easily.
ANGLEBUG=196
TEST=with this option, the failed test with abs.frag passes.
Review URL: http://codereview.appspot.com/4916043
git-svn-id: https://angleproject.googlecode.com/svn/trunk@738 736b8ea6-26fd-11df-bfd4-992fa37f6226
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09c323a4
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2011-08-12T18:22:25
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Add an option to support for GL_OES_EGL_image_external.
Comes with this extension is the new sampler type samplerExternalOES.
ANGLEBUG=175
TEST=compile the attached shader file
Review URL: http://codereview.appspot.com/4809076
git-svn-id: https://angleproject.googlecode.com/svn/trunk@728 736b8ea6-26fd-11df-bfd4-992fa37f6226
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dc4b4f85
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2011-06-17T00:42:53
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Always emit precision in shader variable declarations.
After the shader compile (and before code output), the precision scopes are already lost. In order to correctly output precisions, we need to emit precision in each variable declaration, therefore, each variable should have its precision set. This CL fixes the bugs that the precisions are lost for variables using default precsions and struct fields. Also, this CL fixes a bug in the grammar: constructors are not type_specifier and they shouldn't have precisions.
BUG=168
TEST=webgl conformance tests, gles2 conformance tests.
Review URL: http://codereview.appspot.com/4617041
git-svn-id: https://angleproject.googlecode.com/svn/trunk@695 736b8ea6-26fd-11df-bfd4-992fa37f6226
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5601ea0d
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2011-06-10T18:23:25
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Implement ES2 backend for Angle translator.
With this CL, we have the option to select a code output backend: GLSL, GLSL ES, or HLSL.
Note that we always emit the highest supported float precision for fragment shader due to anglebug 168. Although this is a temporary solution, it's not against GLSL ES spec, because it's ok for implementation to upgrade precision.
Tested with WebGL conformance test suite, GLES2 conformance test suite (only failed 2/1198), and a few webgl demos, including worlds of webgl, aquarium, etc.
anglebug=81
test=translator emitting correct GLSL ES code when ES2 backend is selected.
Review URL: http://codereview.appspot.com/4550129
git-svn-id: https://angleproject.googlecode.com/svn/trunk@687 736b8ea6-26fd-11df-bfd4-992fa37f6226
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