glsl/linker: Fail to link geometry shader without vertex shader.
From section 2.15 (Geometry Shaders) the OpenGL 3.2 spec: A program object that includes a geometry shader must also include a vertex shader; otherwise a link error will occur. Reviewed-by: Paul Berry <stereotype441@gmail.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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@ -1690,6 +1690,14 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
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prog->Version = max_version;
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prog->IsES = is_es_prog;
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/* Geometry shaders have to be linked with vertex shaders.
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*/
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if (num_geom_shaders > 0 && num_vert_shaders == 0) {
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linker_error(prog, "Geometry shader must be linked with "
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"vertex shader\n");
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goto done;
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}
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for (unsigned int i = 0; i < MESA_SHADER_TYPES; i++) {
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if (prog->_LinkedShaders[i] != NULL)
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ctx->Driver.DeleteShader(ctx, prog->_LinkedShaders[i]);
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