+
+ /* ARB_texture_multisample / GL3.2 additions */
+ ctx->Multisample.SampleMask = GL_FALSE;
+ ctx->Multisample.SampleMaskValue = ~(GLbitfield)0;
+}
+
+
+void GLAPIENTRY
+_mesa_GetMultisamplefv(GLenum pname, GLuint index, GLfloat * val)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (ctx->NewState & _NEW_BUFFERS) {
+ _mesa_update_state(ctx);
+ }
+
+ switch (pname) {
+ case GL_SAMPLE_POSITION: {
+ if ((int) index >= ctx->DrawBuffer->Visual.samples) {
+ _mesa_error( ctx, GL_INVALID_VALUE, "glGetMultisamplefv(index)" );
+ return;
+ }
+
+ ctx->Driver.GetSamplePosition(ctx, ctx->DrawBuffer, index, val);
+
+ /* winsys FBOs are upside down */
+ if (_mesa_is_winsys_fbo(ctx->DrawBuffer))
+ val[1] = 1.0f - val[1];
+
+ return;
+ }
+
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetMultisamplefv(pname)" );
+ return;
+ }
+}
+
+void GLAPIENTRY
+_mesa_SampleMaski(GLuint index, GLbitfield mask)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (!ctx->Extensions.ARB_texture_multisample) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleMaski");
+ return;
+ }
+
+ if (index != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glSampleMaski(index)");
+ return;
+ }
+
+ FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
+ ctx->Multisample.SampleMaskValue = mask;
+}
+
+/**
+ * Called via glMinSampleShadingARB
+ */
+void GLAPIENTRY
+_mesa_MinSampleShading(GLclampf value)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (!_mesa_has_ARB_sample_shading(ctx) &&
+ !_mesa_has_OES_sample_shading(ctx)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glMinSampleShading");
+ return;
+ }
+
+ FLUSH_VERTICES(ctx, 0);
+
+ ctx->Multisample.MinSampleShadingValue = CLAMP(value, 0.0f, 1.0f);
+ ctx->NewState |= _NEW_MULTISAMPLE;
+}
+
+/**
+ * Helper for checking a requested sample count against the limit
+ * for a particular (target, internalFormat) pair. The limit imposed,
+ * and the error generated, both depend on which extensions are supported.
+ *
+ * Returns a GL error enum, or GL_NO_ERROR if the requested sample count is
+ * acceptable.
+ */
+GLenum
+_mesa_check_sample_count(struct gl_context *ctx, GLenum target,
+ GLenum internalFormat, GLsizei samples)
+{
+ /* Section 4.4 (Framebuffer objects), page 198 of the OpenGL ES 3.0.0
+ * specification says:
+ *
+ * "If internalformat is a signed or unsigned integer format and samples
+ * is greater than zero, then the error INVALID_OPERATION is generated."
+ *
+ * This restriction is relaxed for OpenGL ES 3.1.
+ */
+ if ((ctx->API == API_OPENGLES2 && ctx->Version == 30) &&
+ _mesa_is_enum_format_integer(internalFormat)
+ && samples > 0) {
+ return GL_INVALID_OPERATION;
+ }
+
+ /* If ARB_internalformat_query is supported, then treat its highest
+ * returned sample count as the absolute maximum for this format; it is
+ * allowed to exceed MAX_SAMPLES.
+ *
+ * From the ARB_internalformat_query spec:
+ *
+ * "If <samples is greater than the maximum number of samples supported
+ * for <internalformat> then the error INVALID_OPERATION is generated."
+ */
+ if (ctx->Extensions.ARB_internalformat_query) {
+ GLint buffer[16] = {-1};
+ GLint limit;
+
+ ctx->Driver.QueryInternalFormat(ctx, target, internalFormat,
+ GL_SAMPLES, buffer);
+ /* since the query returns samples sorted in descending order,
+ * the first element is the greatest supported sample value.
+ */
+ limit = buffer[0];
+
+ return samples > limit ? GL_INVALID_OPERATION : GL_NO_ERROR;
+ }
+
+ /* If ARB_texture_multisample is supported, we have separate limits,
+ * which may be lower than MAX_SAMPLES:
+ *
+ * From the ARB_texture_multisample spec, when describing the operation
+ * of RenderbufferStorageMultisample:
+ *
+ * "If <internalformat> is a signed or unsigned integer format and
+ * <samples> is greater than the value of MAX_INTEGER_SAMPLES, then the
+ * error INVALID_OPERATION is generated"
+ *
+ * And when describing the operation of TexImage*Multisample:
+ *
+ * "The error INVALID_OPERATION may be generated if any of the following
+ * are true:
+ *
+ * * <internalformat> is a depth/stencil-renderable format and <samples>
+ * is greater than the value of MAX_DEPTH_TEXTURE_SAMPLES
+ * * <internalformat> is a color-renderable format and <samples> is
+ * grater than the value of MAX_COLOR_TEXTURE_SAMPLES
+ * * <internalformat> is a signed or unsigned integer format and
+ * <samples> is greater than the value of MAX_INTEGER_SAMPLES
+ */
+
+ if (ctx->Extensions.ARB_texture_multisample) {
+ if (_mesa_is_enum_format_integer(internalFormat))
+ return samples > ctx->Const.MaxIntegerSamples
+ ? GL_INVALID_OPERATION : GL_NO_ERROR;
+
+ if (target == GL_TEXTURE_2D_MULTISAMPLE ||
+ target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) {
+
+ if (_mesa_is_depth_or_stencil_format(internalFormat))
+ return samples > ctx->Const.MaxDepthTextureSamples
+ ? GL_INVALID_OPERATION : GL_NO_ERROR;
+ else
+ return samples > ctx->Const.MaxColorTextureSamples
+ ? GL_INVALID_OPERATION : GL_NO_ERROR;
+ }
+ }
+
+ /* No more specific limit is available, so just use MAX_SAMPLES:
+ *
+ * On p205 of the GL3.1 spec:
+ *
+ * "... or if samples is greater than MAX_SAMPLES, then the error
+ * INVALID_VALUE is generated"
+ */
+ return (GLuint) samples > ctx->Const.MaxSamples
+ ? GL_INVALID_VALUE : GL_NO_ERROR;