1 files changed, 463 insertions, 0 deletions

diff --git a/intern/gawain/src/gwn_batch.c b/intern/gawain/src/gwn_batch.c
new file mode 100644
index 00000000000..359ca956495
--- /dev/null
+++ b/intern/gawain/src/gwn_batch.c
@@ -0,0 +1,463 @@
+
+// Gawain geometry batch
+//
+// This code is part of the Gawain library, with modifications
+// specific to integration with Blender.
+//
+// Copyright 2016 Mike Erwin
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
+// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#include "gwn_batch.h"
+#include "gwn_buffer_id.h"
+#include "gwn_primitive_private.h"
+#include <stdlib.h>
+
+// necessary functions from matrix API
+extern void gpuBindMatrices(const Gwn_ShaderInterface* shaderface);
+extern bool gpuMatricesDirty(void); // how best to use this here?
+
+Gwn_Batch* GWN_batch_create_ex(
+        Gwn_PrimType prim_type, Gwn_VertBuf* verts, Gwn_IndexBuf* elem,
+        unsigned owns_flag)
+	{
+	Gwn_Batch* batch = calloc(1, sizeof(Gwn_Batch));
+
+	GWN_batch_init_ex(batch, prim_type, verts, elem, owns_flag);
+
+	return batch;
+	}
+
+void GWN_batch_init_ex(
+        Gwn_Batch* batch, Gwn_PrimType prim_type, Gwn_VertBuf* verts, Gwn_IndexBuf* elem,
+        unsigned owns_flag)
+	{
+#if TRUST_NO_ONE
+	assert(verts != NULL);
+#endif
+
+	batch->verts[0] = verts;
+	for (int v = 1; v < GWN_BATCH_VBO_MAX_LEN; ++v)
+		batch->verts[v] = NULL;
+	batch->elem = elem;
+	batch->prim_type = prim_type;
+	batch->gl_prim_type = convert_prim_type_to_gl(prim_type);
+	batch->phase = GWN_BATCH_READY_TO_DRAW;
+	batch->owns_flag = owns_flag;
+	}
+
+void GWN_batch_discard(Gwn_Batch* batch)
+	{
+	if (batch->owns_flag & GWN_BATCH_OWNS_INDEX)
+		GWN_indexbuf_discard(batch->elem);
+
+	if ((batch->owns_flag & ~GWN_BATCH_OWNS_INDEX) != 0)
+		{
+		for (int v = 0; v < GWN_BATCH_VBO_MAX_LEN; ++v)
+			{
+			if (batch->verts[v] == NULL)
+				break;
+			if (batch->owns_flag & (1 << v))
+				GWN_vertbuf_discard(batch->verts[v]);
+			}
+		}
+
+	if (batch->vao_id)
+		GWN_vao_free(batch->vao_id);
+
+	free(batch);
+	}
+
+int GWN_batch_vertbuf_add_ex(
+        Gwn_Batch* batch, Gwn_VertBuf* verts,
+        bool own_vbo)
+	{
+	for (unsigned v = 0; v < GWN_BATCH_VBO_MAX_LEN; ++v)
+		{
+		if (batch->verts[v] == NULL)
+			{
+#if TRUST_NO_ONE
+			// for now all VertexBuffers must have same vertex_ct
+			assert(verts->vertex_ct == batch->verts[0]->vertex_ct);
+			// in the near future we will enable instanced attribs which have their own vertex_ct
+#endif
+			batch->verts[v] = verts;
+			// TODO: mark dirty so we can keep attrib bindings up-to-date
+			if (own_vbo)
+				batch->owns_flag |= (1 << v);
+			return v;
+			}
+		}
+	
+	// we only make it this far if there is no room for another Gwn_VertBuf
+#if TRUST_NO_ONE
+	assert(false);
+#endif
+	return -1;
+	}
+
+void GWN_batch_program_set(Gwn_Batch* batch, GLuint program, const Gwn_ShaderInterface* shaderface)
+	{
+#if TRUST_NO_ONE
+	assert(glIsProgram(program));
+#endif
+
+	batch->program = program;
+	batch->interface = shaderface;
+	batch->program_dirty = true;
+
+	GWN_batch_program_use_begin(batch); // hack! to make Batch_Uniform* simpler
+	}
+
+static void Batch_update_program_bindings(Gwn_Batch* batch)
+	{
+	// disable all as a precaution
+	// why are we not using prev_attrib_enabled_bits?? see immediate.c
+	for (unsigned a_idx = 0; a_idx < GWN_VERT_ATTR_MAX_LEN; ++a_idx)
+		glDisableVertexAttribArray(a_idx);
+
+	for (int v = 0; v < GWN_BATCH_VBO_MAX_LEN; ++v)
+		{
+		Gwn_VertBuf* verts = batch->verts[v];
+		if (verts == NULL)
+			break;
+
+		const Gwn_VertFormat* format = &verts->format;
+
+		const unsigned attrib_ct = format->attrib_ct;
+		const unsigned stride = format->stride;
+
+		GWN_vertbuf_use(verts);
+
+		for (unsigned a_idx = 0; a_idx < attrib_ct; ++a_idx)
+			{
+			const Gwn_VertAttr* a = format->attribs + a_idx;
+
+			const GLvoid* pointer = (const GLubyte*)0 + a->offset;
+
+			for (unsigned n_idx = 0; n_idx < a->name_ct; ++n_idx)
+				{
+				const Gwn_ShaderInput* input = GWN_shaderinterface_attr(batch->interface, a->name[n_idx]);
+
+				if (input == NULL) continue;
+
+				glEnableVertexAttribArray(input->location);
+
+				switch (a->fetch_mode)
+					{
+					case GWN_FETCH_FLOAT:
+					case GWN_FETCH_INT_TO_FLOAT:
+						glVertexAttribPointer(input->location, a->comp_ct, a->gl_comp_type, GL_FALSE, stride, pointer);
+						break;
+					case GWN_FETCH_INT_TO_FLOAT_UNIT:
+						glVertexAttribPointer(input->location, a->comp_ct, a->gl_comp_type, GL_TRUE, stride, pointer);
+						break;
+					case GWN_FETCH_INT:
+						glVertexAttribIPointer(input->location, a->comp_ct, a->gl_comp_type, stride, pointer);
+					}
+				}
+			}
+		}
+
+	batch->program_dirty = false;
+	}
+
+void GWN_batch_program_use_begin(Gwn_Batch* batch)
+	{
+	// NOTE: use_program & done_using_program are fragile, depend on staying in sync with
+	//       the GL context's active program. use_program doesn't mark other programs as "not used".
+	// TODO: make not fragile (somehow)
+
+	if (!batch->program_in_use)
+		{
+		glUseProgram(batch->program);
+		batch->program_in_use = true;
+		}
+	}
+
+void GWN_batch_program_use_end(Gwn_Batch* batch)
+	{
+	if (batch->program_in_use)
+		{
+		glUseProgram(0);
+		batch->program_in_use = false;
+		}
+	}
+
+#if TRUST_NO_ONE
+  #define GET_UNIFORM const Gwn_ShaderInput* uniform = GWN_shaderinterface_uniform(batch->interface, name); assert(uniform);
+#else
+  #define GET_UNIFORM const Gwn_ShaderInput* uniform = GWN_shaderinterface_uniform(batch->interface, name);
+#endif
+
+void GWN_batch_uniform_1i(Gwn_Batch* batch, const char* name, int value)
+	{
+	GET_UNIFORM
+	glUniform1i(uniform->location, value);
+	}
+
+void GWN_batch_uniform_1b(Gwn_Batch* batch, const char* name, bool value)
+	{
+	GET_UNIFORM
+	glUniform1i(uniform->location, value ? GL_TRUE : GL_FALSE);
+	}
+
+void GWN_batch_uniform_2f(Gwn_Batch* batch, const char* name, float x, float y)
+	{
+	GET_UNIFORM
+	glUniform2f(uniform->location, x, y);
+	}
+
+void GWN_batch_uniform_3f(Gwn_Batch* batch, const char* name, float x, float y, float z)
+	{
+	GET_UNIFORM
+	glUniform3f(uniform->location, x, y, z);
+	}
+
+void GWN_batch_uniform_4f(Gwn_Batch* batch, const char* name, float x, float y, float z, float w)
+	{
+	GET_UNIFORM
+	glUniform4f(uniform->location, x, y, z, w);
+	}
+
+void GWN_batch_uniform_1f(Gwn_Batch* batch, const char* name, float x)
+	{
+	GET_UNIFORM
+	glUniform1f(uniform->location, x);
+	}
+
+void GWN_batch_uniform_2fv(Gwn_Batch* batch, const char* name, const float data[2])
+	{
+	GET_UNIFORM
+	glUniform2fv(uniform->location, 1, data);
+	}
+
+void GWN_batch_uniform_3fv(Gwn_Batch* batch, const char* name, const float data[3])
+	{
+	GET_UNIFORM
+	glUniform3fv(uniform->location, 1, data);
+	}
+
+void GWN_batch_uniform_4fv(Gwn_Batch* batch, const char* name, const float data[4])
+	{
+	GET_UNIFORM
+	glUniform4fv(uniform->location, 1, data);
+	}
+
+static void Batch_prime(Gwn_Batch* batch)
+	{
+	batch->vao_id = GWN_vao_alloc();
+	glBindVertexArray(batch->vao_id);
+
+	for (int v = 0; v < GWN_BATCH_VBO_MAX_LEN; ++v)
+		{
+		if (batch->verts[v] == NULL)
+			break;
+		GWN_vertbuf_use(batch->verts[v]);
+		}
+
+	if (batch->elem)
+		GWN_indexbuf_use(batch->elem);
+
+	// vertex attribs and element list remain bound to this VAO
+	}
+
+void GWN_batch_draw(Gwn_Batch* batch)
+	{
+#if TRUST_NO_ONE
+	assert(batch->phase == GWN_BATCH_READY_TO_DRAW);
+	assert(glIsProgram(batch->program));
+#endif
+
+	if (batch->vao_id)
+		glBindVertexArray(batch->vao_id);
+	else
+		Batch_prime(batch);
+
+	if (batch->program_dirty)
+		Batch_update_program_bindings(batch);
+
+	GWN_batch_program_use_begin(batch);
+
+	gpuBindMatrices(batch->interface);
+
+	if (batch->elem)
+		{
+		const Gwn_IndexBuf* el = batch->elem;
+
+#if GWN_TRACK_INDEX_RANGE
+		if (el->base_index)
+			glDrawRangeElementsBaseVertex(batch->gl_prim_type, el->min_index, el->max_index, el->index_ct, el->gl_index_type, 0, el->base_index);
+		else
+			glDrawRangeElements(batch->gl_prim_type, el->min_index, el->max_index, el->index_ct, el->gl_index_type, 0);
+#else
+		glDrawElements(batch->gl_prim_type, el->index_ct, GL_UNSIGNED_INT, 0);
+#endif
+		}
+	else
+		glDrawArrays(batch->gl_prim_type, 0, batch->verts[0]->vertex_ct);
+
+	GWN_batch_program_use_end(batch);
+	glBindVertexArray(0);
+	}
+
+
+
+// clement : temp stuff
+void GWN_batch_draw_stupid(Gwn_Batch* batch)
+	{
+	if (batch->vao_id)
+		glBindVertexArray(batch->vao_id);
+	else
+		Batch_prime(batch);
+
+	if (batch->program_dirty)
+		Batch_update_program_bindings(batch);
+
+	// GWN_batch_program_use_begin(batch);
+
+	//gpuBindMatrices(batch->program);
+
+	if (batch->elem)
+		{
+		const Gwn_IndexBuf* el = batch->elem;
+
+#if GWN_TRACK_INDEX_RANGE
+		if (el->base_index)
+			glDrawRangeElementsBaseVertex(batch->gl_prim_type, el->min_index, el->max_index, el->index_ct, el->gl_index_type, 0, el->base_index);
+		else
+			glDrawRangeElements(batch->gl_prim_type, el->min_index, el->max_index, el->index_ct, el->gl_index_type, 0);
+#else
+		glDrawElements(batch->gl_prim_type, el->index_ct, GL_UNSIGNED_INT, 0);
+#endif
+		}
+	else
+		glDrawArrays(batch->gl_prim_type, 0, batch->verts[0]->vertex_ct);
+
+	// GWN_batch_program_use_end(batch);
+	glBindVertexArray(0);
+	}
+
+// clement : temp stuff
+void GWN_batch_draw_stupid_instanced(Gwn_Batch* batch, unsigned int instance_vbo, int instance_count,
+                                 int attrib_nbr, int attrib_stride, int attrib_size[16], int attrib_loc[16])
+	{
+	if (batch->vao_id)
+		glBindVertexArray(batch->vao_id);
+	else
+		Batch_prime(batch);
+
+	if (batch->program_dirty)
+		Batch_update_program_bindings(batch);
+
+	glBindBuffer(GL_ARRAY_BUFFER, instance_vbo);
+	int ptr_ofs = 0;
+	for (int i = 0; i < attrib_nbr; ++i)
+		{
+		int size = attrib_size[i];
+		int loc = attrib_loc[i];
+		int atr_ofs = 0;
+
+		while (size > 0)
+			{
+			glEnableVertexAttribArray(loc + atr_ofs);
+			glVertexAttribPointer(loc + atr_ofs, (size > 4) ? 4 : size, GL_FLOAT, GL_FALSE,
+			                      sizeof(float) * attrib_stride, (GLvoid*)(sizeof(float) * ptr_ofs));
+			glVertexAttribDivisor(loc + atr_ofs, 1);
+			atr_ofs++;
+			ptr_ofs += (size > 4) ? 4 : size;
+			size -= 4;
+			}
+		}
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+	// GWN_batch_program_use_begin(batch);
+
+	//gpuBindMatrices(batch->program);
+
+	if (batch->elem)
+		{
+		const Gwn_IndexBuf* el = batch->elem;
+#if GWN_TRACK_INDEX_RANGE
+		glDrawElementsInstancedBaseVertex(batch->gl_prim_type, el->index_ct, el->gl_index_type, 0, instance_count, el->base_index);
+#else
+		glDrawElementsInstanced(batch->gl_prim_type, el->index_ct, GL_UNSIGNED_INT, 0, instance_count);
+#endif
+		}
+	else
+		glDrawArraysInstanced(batch->gl_prim_type, 0, batch->verts[0]->vertex_ct, instance_count);
+
+	// GWN_batch_program_use_end(batch);
+	glBindVertexArray(0);
+	}
+
+void GWN_batch_draw_stupid_instanced_with_batch(Gwn_Batch* batch_instanced, Gwn_Batch* batch_instancing)
+	{
+	if (batch_instanced->vao_id)
+		glBindVertexArray(batch_instanced->vao_id);
+	else
+		Batch_prime(batch_instanced);
+
+	if (batch_instanced->program_dirty)
+		Batch_update_program_bindings(batch_instanced);
+
+	Gwn_VertBuf* verts = batch_instancing->verts[0];
+
+	const Gwn_VertFormat* format = &verts->format;
+
+	const unsigned attrib_ct = format->attrib_ct;
+	const unsigned stride = format->stride;
+
+	GWN_vertbuf_use(verts);
+
+	for (unsigned a_idx = 0; a_idx < attrib_ct; ++a_idx)
+		{
+		const Gwn_VertAttr* a = format->attribs + a_idx;
+
+		const GLvoid* pointer = (const GLubyte*)0 + a->offset;
+
+		for (unsigned n_idx = 0; n_idx < a->name_ct; ++n_idx)
+			{
+			const Gwn_ShaderInput* input = GWN_shaderinterface_attr(batch_instanced->interface, a->name[n_idx]);
+
+			if (input == NULL) continue;
+
+			glEnableVertexAttribArray(input->location);
+			glVertexAttribDivisor(input->location, 1);
+
+			switch (a->fetch_mode)
+				{
+				case GWN_FETCH_FLOAT:
+				case GWN_FETCH_INT_TO_FLOAT:
+					glVertexAttribPointer(input->location, a->comp_ct, a->gl_comp_type, GL_FALSE, stride, pointer);
+					break;
+				case GWN_FETCH_INT_TO_FLOAT_UNIT:
+					glVertexAttribPointer(input->location, a->comp_ct, a->gl_comp_type, GL_TRUE, stride, pointer);
+					break;
+				case GWN_FETCH_INT:
+					glVertexAttribIPointer(input->location, a->comp_ct, a->gl_comp_type, stride, pointer);
+				}
+			}
+		}
+
+	// GWN_batch_program_use_begin(batch);
+
+	//gpuBindMatrices(batch->program);
+
+	if (batch_instanced->elem)
+		{
+		const Gwn_IndexBuf* el = batch_instanced->elem;
+
+#if GWN_TRACK_INDEX_RANGE
+		glDrawElementsInstancedBaseVertex(batch_instanced->gl_prim_type, el->index_ct, el->gl_index_type, 0, verts->vertex_ct, el->base_index);
+#else
+		glDrawElementsInstanced(batch_instanced->gl_prim_type, el->index_ct, GL_UNSIGNED_INT, 0, verts->vertex_ct);
+#endif
+		}
+	else
+		glDrawArraysInstanced(batch_instanced->gl_prim_type, 0, batch_instanced->verts[0]->vertex_ct, verts->vertex_ct);
+
+	// GWN_batch_program_use_end(batch);
+	glBindVertexArray(0);
+	}