DRW: Refactor & Split draw_manager.c into multiple files.

Refactor include:
- Removal of DRWInterface. (was useless)
- Split DRWCallHeader into a new struct DRWCallState that will be reused in the future.
- Use BLI_link_utils for APPEND/PREPEND.
- Creation of the new DRWManager struct type. This will enable us to create more than one manager in the future.
- Removal of some dead code.

1 files changed, 213 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_manager_texture.c b/source/blender/draw/intern/draw_manager_texture.c
new file mode 100644
index 00000000000..bbef680e77a
--- /dev/null
+++ b/source/blender/draw/intern/draw_manager_texture.c
@@ -0,0 +1,213 @@
+/*
+ * Copyright 2016, Blender Foundation.
+ *
+ * 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.
+ *
+ * Contributor(s): Blender Institute
+ *
+ */
+
+/** \file blender/draw/intern/draw_manager_texture.c
+ *  \ingroup draw
+ */
+
+#include "draw_manager.h"
+
+void drw_texture_get_format(
+        DRWTextureFormat format, bool is_framebuffer,
+        GPUTextureFormat *r_data_type, int *r_channels, bool *r_is_depth)
+{
+	/* Some formats do not work with framebuffers. */
+	if (is_framebuffer) {
+		switch (format) {
+			/* Only add formats that are COMPATIBLE with FB.
+			 * Generally they are multiple of 16bit. */
+			case DRW_TEX_R_16:
+			case DRW_TEX_R_32:
+			case DRW_TEX_RG_8:
+			case DRW_TEX_RG_16:
+			case DRW_TEX_RG_16I:
+			case DRW_TEX_RG_32:
+			case DRW_TEX_RGBA_8:
+			case DRW_TEX_RGBA_16:
+			case DRW_TEX_RGBA_32:
+			case DRW_TEX_DEPTH_16:
+			case DRW_TEX_DEPTH_24:
+			case DRW_TEX_DEPTH_24_STENCIL_8:
+			case DRW_TEX_DEPTH_32:
+			case DRW_TEX_RGB_11_11_10:
+				break;
+			default:
+				BLI_assert(false && "Texture format unsupported as render target!");
+				*r_channels = 4;
+				*r_data_type = GPU_RGBA8;
+				*r_is_depth = false;
+				return;
+		}
+	}
+
+	switch (format) {
+		case DRW_TEX_RGBA_8: *r_data_type = GPU_RGBA8; break;
+		case DRW_TEX_RGBA_16: *r_data_type = GPU_RGBA16F; break;
+		case DRW_TEX_RGBA_32: *r_data_type = GPU_RGBA32F; break;
+		case DRW_TEX_RGB_16: *r_data_type = GPU_RGB16F; break;
+		case DRW_TEX_RGB_11_11_10: *r_data_type = GPU_R11F_G11F_B10F; break;
+		case DRW_TEX_RG_8: *r_data_type = GPU_RG8; break;
+		case DRW_TEX_RG_16: *r_data_type = GPU_RG16F; break;
+		case DRW_TEX_RG_16I: *r_data_type = GPU_RG16I; break;
+		case DRW_TEX_RG_32: *r_data_type = GPU_RG32F; break;
+		case DRW_TEX_R_8: *r_data_type = GPU_R8; break;
+		case DRW_TEX_R_16: *r_data_type = GPU_R16F; break;
+		case DRW_TEX_R_32: *r_data_type = GPU_R32F; break;
+#if 0
+		case DRW_TEX_RGB_8: *r_data_type = GPU_RGB8; break;
+		case DRW_TEX_RGB_32: *r_data_type = GPU_RGB32F; break;
+#endif
+		case DRW_TEX_DEPTH_16: *r_data_type = GPU_DEPTH_COMPONENT16; break;
+		case DRW_TEX_DEPTH_24: *r_data_type = GPU_DEPTH_COMPONENT24; break;
+		case DRW_TEX_DEPTH_24_STENCIL_8: *r_data_type = GPU_DEPTH24_STENCIL8; break;
+		case DRW_TEX_DEPTH_32: *r_data_type = GPU_DEPTH_COMPONENT32F; break;
+		default :
+			/* file type not supported you must uncomment it from above */
+			BLI_assert(false);
+			break;
+	}
+
+	switch (format) {
+		case DRW_TEX_RGBA_8:
+		case DRW_TEX_RGBA_16:
+		case DRW_TEX_RGBA_32:
+			*r_channels = 4;
+			break;
+		case DRW_TEX_RGB_8:
+		case DRW_TEX_RGB_16:
+		case DRW_TEX_RGB_32:
+		case DRW_TEX_RGB_11_11_10:
+			*r_channels = 3;
+			break;
+		case DRW_TEX_RG_8:
+		case DRW_TEX_RG_16:
+		case DRW_TEX_RG_16I:
+		case DRW_TEX_RG_32:
+			*r_channels = 2;
+			break;
+		default:
+			*r_channels = 1;
+			break;
+	}
+
+	if (r_is_depth) {
+		*r_is_depth = ELEM(format, DRW_TEX_DEPTH_16, DRW_TEX_DEPTH_24, DRW_TEX_DEPTH_24_STENCIL_8);
+	}
+}
+
+void drw_texture_set_parameters(GPUTexture *tex, DRWTextureFlag flags)
+{
+	GPU_texture_bind(tex, 0);
+	if (flags & DRW_TEX_MIPMAP) {
+		GPU_texture_mipmap_mode(tex, true, flags & DRW_TEX_FILTER);
+		DRW_texture_generate_mipmaps(tex);
+	}
+	else {
+		GPU_texture_filter_mode(tex, flags & DRW_TEX_FILTER);
+	}
+	GPU_texture_wrap_mode(tex, flags & DRW_TEX_WRAP);
+	GPU_texture_compare_mode(tex, flags & DRW_TEX_COMPARE);
+	GPU_texture_unbind(tex);
+}
+
+GPUTexture *DRW_texture_create_1D(int w, DRWTextureFormat format, DRWTextureFlag flags, const float *fpixels)
+{
+	GPUTexture *tex;
+	GPUTextureFormat data_type;
+	int channels;
+
+	drw_texture_get_format(format, false, &data_type, &channels, NULL);
+	tex = GPU_texture_create_1D_custom(w, channels, data_type, fpixels, NULL);
+	drw_texture_set_parameters(tex, flags);
+
+	return tex;
+}
+
+GPUTexture *DRW_texture_create_2D(int w, int h, DRWTextureFormat format, DRWTextureFlag flags, const float *fpixels)
+{
+	GPUTexture *tex;
+	GPUTextureFormat data_type;
+	int channels;
+
+	drw_texture_get_format(format, false, &data_type, &channels, NULL);
+	tex = GPU_texture_create_2D_custom(w, h, channels, data_type, fpixels, NULL);
+	drw_texture_set_parameters(tex, flags);
+
+	return tex;
+}
+
+GPUTexture *DRW_texture_create_2D_array(
+        int w, int h, int d, DRWTextureFormat format, DRWTextureFlag flags, const float *fpixels)
+{
+	GPUTexture *tex;
+	GPUTextureFormat data_type;
+	int channels;
+
+	drw_texture_get_format(format, false, &data_type, &channels, NULL);
+	tex = GPU_texture_create_2D_array_custom(w, h, d, channels, data_type, fpixels, NULL);
+	drw_texture_set_parameters(tex, flags);
+
+	return tex;
+}
+
+GPUTexture *DRW_texture_create_3D(
+        int w, int h, int d, DRWTextureFormat format, DRWTextureFlag flags, const float *fpixels)
+{
+	GPUTexture *tex;
+	GPUTextureFormat data_type;
+	int channels;
+
+	drw_texture_get_format(format, false, &data_type, &channels, NULL);
+	tex = GPU_texture_create_3D_custom(w, h, d, channels, data_type, fpixels, NULL);
+	drw_texture_set_parameters(tex, flags);
+
+	return tex;
+}
+
+GPUTexture *DRW_texture_create_cube(int w, DRWTextureFormat format, DRWTextureFlag flags, const float *fpixels)
+{
+	GPUTexture *tex;
+	GPUTextureFormat data_type;
+	int channels;
+
+	drw_texture_get_format(format, false, &data_type, &channels, NULL);
+	tex = GPU_texture_create_cube_custom(w, channels, data_type, fpixels, NULL);
+	drw_texture_set_parameters(tex, flags);
+
+	return tex;
+}
+
+void DRW_texture_generate_mipmaps(GPUTexture *tex)
+{
+	GPU_texture_bind(tex, 0);
+	GPU_texture_generate_mipmap(tex);
+	GPU_texture_unbind(tex);
+}
+
+void DRW_texture_update(GPUTexture *tex, const float *pixels)
+{
+	GPU_texture_update(tex, pixels);
+}
+
+void DRW_texture_free(GPUTexture *tex)
+{
+	GPU_texture_free(tex);
+}