GPUShader: GL backend isolation

1 files changed, 79 insertions, 0 deletions

diff --git a/source/blender/gpu/opengl/gl_shader.hh b/source/blender/gpu/opengl/gl_shader.hh
new file mode 100644
index 00000000000..3bdc9aa80d5
--- /dev/null
+++ b/source/blender/gpu/opengl/gl_shader.hh
@@ -0,0 +1,79 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup gpu
+ *
+ * GPUDrawList is an API to do lots of similar draw-calls very fast using
+ * multi-draw-indirect. There is a fallback if the feature is not supported.
+ */
+
+#pragma once
+
+#include "MEM_guardedalloc.h"
+
+#include "glew-mx.h"
+
+#include "gpu_shader_private.hh"
+
+namespace blender {
+namespace gpu {
+
+class GLShader : public Shader {
+ private:
+  /** Handle for full program (links shader stages below). */
+  GLuint shader_program_ = 0;
+
+  GLuint vert_shader_ = 0;
+  GLuint geom_shader_ = 0;
+  GLuint frag_shader_ = 0;
+
+  eGPUShaderTFBType transform_feedback_type_ = GPU_SHADER_TFB_NONE;
+
+ public:
+  GLShader(const char *name);
+  ~GLShader();
+
+  /* Return true on success. */
+  void vertex_shader_from_glsl(MutableSpan<const char *> sources) override;
+  void geometry_shader_from_glsl(MutableSpan<const char *> sources) override;
+  void fragment_shader_from_glsl(MutableSpan<const char *> sources) override;
+  bool finalize(void) override;
+
+  void transform_feedback_names_set(Span<const char *> name_list,
+                                    const eGPUShaderTFBType geom_type);
+  bool transform_feedback_enable(GPUVertBuf *buf) override;
+  void transform_feedback_disable(void) override;
+
+  void bind(void) override;
+  void unbind(void) override;
+
+  void uniform_float(int location, int comp_len, int array_size, const float *data) override;
+  void uniform_int(int location, int comp_len, int array_size, const int *data) override;
+
+ private:
+  char *glsl_patch_get(void);
+
+  GLuint create_shader_stage(GLenum gl_stage, MutableSpan<const char *> sources);
+
+  MEM_CXX_CLASS_ALLOC_FUNCS("GLShader");
+};
+
+}  // namespace gpu
+}  // namespace blender