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GWN: Add GWN_batch_draw_procedural 

This allow to drawn large amounts of primitives without any memory footprint.
This commit is contained in:
Clément Foucault 2018-02-14 17:55:01 +01:00
parent 0f3bc636c8
commit 1e9ef2a25e
2 changed files with 16 additions and 3 deletions
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4
intern/gawain/gawain/gwn_batch.h
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@ -85,11 +85,9 @@ void GWN_batch_uniform_4fv(Gwn_Batch*, const char* name, const float data[4]);
void GWN_batch_draw(Gwn_Batch*);
// clement : temp stuff
void GWN_batch_draw_stupid(Gwn_Batch*, int v_first, int v_count);
void GWN_batch_draw_stupid_instanced(Gwn_Batch*, Gwn_Batch*, int instance_first, int instance_count);
void GWN_batch_draw_procedural(Gwn_Batch*, Gwn_PrimType, int v_count);
#if 0 // future plans

15
intern/gawain/src/gwn_batch.c
View File

@ -417,3 +417,18 @@ void GWN_batch_draw_stupid_instanced(Gwn_Batch* batch_instanced, Gwn_Batch* batc
glBindVertexArray(0);
}
// just draw some vertices and let shader place them where we want.
void GWN_batch_draw_procedural(Gwn_Batch* batch, Gwn_PrimType prim_type, int v_count)
{
// we cannot draw without vao ... annoying ...
if (batch->vao_id)
glBindVertexArray(batch->vao_id);
else
Batch_prime(batch);
GLenum type = convert_prim_type_to_gl(prim_type);
glDrawArrays(type, 0, v_count);
glBindVertexArray(0);
}