# HG changeset patch
# User Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
# Date 1425584201 -3600
# Node ID ec972eb443916c45d468070e4eca354d37cd5aaf
# Parent  13789ac717c488c23dc623bff1392dd2d460c4d7
Use a specific vbo/vao pair for text rendering.

diff --git a/pytouhou/ui/opengl/renderer.pxd b/pytouhou/ui/opengl/renderer.pxd
--- a/pytouhou/ui/opengl/renderer.pxd
+++ b/pytouhou/ui/opengl/renderer.pxd
@@ -9,6 +9,12 @@ cdef struct Vertex:
     unsigned char r, g, b, a
 
 
+cdef struct TextVertex:
+    short x, y
+    float u, v
+    unsigned char r, g, b, a
+
+
 cdef class Texture:
     cdef long key
     cdef GLuint texture
@@ -26,8 +32,8 @@ cdef class Renderer:
     cdef long x, y, width, height
 
     # For modern GL.
-    cdef GLuint vbo
-    cdef GLuint vao
+    cdef GLuint vbo, text_vbo
+    cdef GLuint vao, text_vao
 
     cdef GLuint textures[MAX_TEXTURES]
     cdef unsigned short *indices[MAX_TEXTURES][2]
@@ -35,5 +41,6 @@ cdef class Renderer:
     cdef PyObject *elements[640*3]
 
     cdef void set_state(self) nogil
+    cdef void set_text_state(self) nogil
     cdef bint render_elements(self, elements) except True
     cdef bint render_quads(self, rects, colors, GLuint texture) except True
diff --git a/pytouhou/ui/opengl/renderer.pyx b/pytouhou/ui/opengl/renderer.pyx
--- a/pytouhou/ui/opengl/renderer.pyx
+++ b/pytouhou/ui/opengl/renderer.pyx
@@ -90,6 +90,7 @@ cdef class Renderer:
 
             if use_vao:
                 glDeleteVertexArrays(1, &self.vao)
+                glDeleteVertexArrays(1, &self.text_vao)
 
 
     def __init__(self, resource_loader):
@@ -106,12 +107,17 @@ cdef class Renderer:
                 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "Renderer creation")
 
             glGenBuffers(1, &self.vbo)
+            glGenBuffers(1, &self.text_vbo)
 
             if use_vao:
                 glGenVertexArrays(1, &self.vao)
                 glBindVertexArray(self.vao)
                 self.set_state()
 
+                glGenVertexArrays(1, &self.text_vao)
+                glBindVertexArray(self.text_vao)
+                self.set_text_state()
+
             if use_debug_group:
                 glPopDebugGroup()
 
@@ -130,6 +136,20 @@ cdef class Renderer:
         glBindBuffer(GL_ARRAY_BUFFER, 0)
 
 
+    cdef void set_text_state(self) nogil:
+        glBindBuffer(GL_ARRAY_BUFFER, self.text_vbo)
+
+        #TODO: find a way to use offsetof() instead of those ugly substractions.
+        glVertexAttribPointer(0, 2, GL_SHORT, False, sizeof(Vertex), <void*>0)
+        glEnableVertexAttribArray(0)
+        glVertexAttribPointer(1, 2, GL_FLOAT, False, sizeof(Vertex), <void*>4)
+        glEnableVertexAttribArray(1)
+        glVertexAttribPointer(2, 4, GL_UNSIGNED_BYTE, True, sizeof(Vertex), <void*>12)
+        glEnableVertexAttribArray(2)
+
+        glBindBuffer(GL_ARRAY_BUFFER, 0)
+
+
     cdef bint render_elements(self, elements) except True:
         cdef Element element
 
@@ -234,7 +254,7 @@ cdef class Renderer:
 
     cdef bint render_quads(self, rects, colors, GLuint texture) except True:
         # There is nothing that batch more than two quads on the same texture, currently.
-        cdef Vertex buf[8]
+        cdef TextVertex buf[8]
         cdef unsigned short indices[12]
 
         if not is_legacy:
@@ -249,27 +269,27 @@ cdef class Renderer:
         for i, r in enumerate(rects):
             c1, c2, c3, c4 = colors[i]
 
-            buf[4*i] = Vertex(r.x, r.y, 0, 0, 0, 0, c1.r, c1.g, c1.b, c1.a)
-            buf[4*i+1] = Vertex(r.x + r.w, r.y, 0, 0, 1, 0, c2.r, c2.g, c2.b, c2.a)
-            buf[4*i+2] = Vertex(r.x + r.w, r.y + r.h, 0, 0, 1, 1, c3.r, c3.g, c3.b, c3.a)
-            buf[4*i+3] = Vertex(r.x, r.y + r.h, 0, 0, 0, 1, c4.r, c4.g, c4.b, c4.a)
+            buf[4*i] = TextVertex(r.x, r.y, 0, 0, c1.r, c1.g, c1.b, c1.a)
+            buf[4*i+1] = TextVertex(r.x + r.w, r.y, 1, 0, c2.r, c2.g, c2.b, c2.a)
+            buf[4*i+2] = TextVertex(r.x + r.w, r.y + r.h, 1, 1, c3.r, c3.g, c3.b, c3.a)
+            buf[4*i+3] = TextVertex(r.x, r.y + r.h, 0, 1, c4.r, c4.g, c4.b, c4.a)
 
         if use_debug_group:
             glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "Quads drawing")
 
         if is_legacy:
-            glVertexPointer(3, GL_SHORT, sizeof(Vertex), &buf[0].x)
-            glTexCoordPointer(2, GL_FLOAT, sizeof(Vertex), &buf[0].u)
-            glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(Vertex), &buf[0].r)
+            glVertexPointer(2, GL_SHORT, sizeof(TextVertex), &buf[0].x)
+            glTexCoordPointer(2, GL_FLOAT, sizeof(TextVertex), &buf[0].u)
+            glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(TextVertex), &buf[0].r)
         else:
-            glBindBuffer(GL_ARRAY_BUFFER, self.vbo)
-            glBufferData(GL_ARRAY_BUFFER, 4 * length * sizeof(Vertex), buf, GL_DYNAMIC_DRAW)
+            glBindBuffer(GL_ARRAY_BUFFER, self.text_vbo)
+            glBufferData(GL_ARRAY_BUFFER, 4 * length * sizeof(TextVertex), buf, GL_DYNAMIC_DRAW)
             glBindBuffer(GL_ARRAY_BUFFER, 0)
 
             if use_vao:
-                glBindVertexArray(self.vao)
+                glBindVertexArray(self.text_vao)
             else:
-                self.set_state()
+                self.set_text_state()
 
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
         glBindTexture(GL_TEXTURE_2D, texture)