Implement primitive drawing methods for Emscripten

cocos2dx/draw_nodes/CCDrawingPrimitives.cpp

@@ -60,6 +60,33 @@ static ccColor4F s_tColor = {1.0f,1.0f,1.0f,1.0f};
 static int s_nPointSizeLocation = -1;
 static GLfloat s_fPointSize = 1.0f;
 
+#ifdef EMSCRIPTEN
+static GLuint s_bufferObject = 0;
+static GLuint s_bufferSize = 0;
+
+static void setGLBufferData(void *buf, GLuint bufSize)
+{
+    if(s_bufferSize < bufSize)
+    {
+        if(s_bufferObject)
+        {
+            glDeleteBuffers(1, &s_bufferObject);
+        }
+        glGenBuffers(1, &s_bufferObject);
+        s_bufferSize = bufSize;
+
+        glBindBuffer(GL_ARRAY_BUFFER, s_bufferObject);
+        glBufferData(GL_ARRAY_BUFFER, bufSize, buf, GL_DYNAMIC_DRAW);
+    }
+    else
+    {
+        glBindBuffer(GL_ARRAY_BUFFER, s_bufferObject);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, bufSize, buf);
+    }
+}
+
+#endif // EMSCRIPTEN
+
 static void lazy_init( void )
 {
     if( ! s_bInitialized ) {
@@ -106,11 +133,13 @@ void ccDrawPoint( const CCPoint& point )
     s_pShader->setUniformLocationWith4fv(s_nColorLocation, (GLfloat*) &s_tColor.r, 1);
     s_pShader->setUniformLocationWith1f(s_nPointSizeLocation, s_fPointSize);
 
-    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, &p);
-
 #ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
+    setGLBufferData(&p, 8);
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, &p);
 #endif // EMSCRIPTEN
+
     glDrawArrays(GL_POINTS, 0, 1);
 
     CC_INCREMENT_GL_DRAWS(1);
@@ -132,7 +161,12 @@ void ccDrawPoints( const CCPoint *points, unsigned int numberOfPoints )
     // iPhone and 32-bit machines optimization
     if( sizeof(CCPoint) == sizeof(ccVertex2F) )
     {
+#ifdef EMSCRIPTEN
+        setGLBufferData((void*) points, numberOfPoints * sizeof(CCPoint));
+        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
         glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, points);
+#endif // EMSCRIPTEN
     }
     else
     {
@@ -141,12 +175,17 @@ void ccDrawPoints( const CCPoint *points, unsigned int numberOfPoints )
             newPoints[i].x = points[i].x;
             newPoints[i].y = points[i].y;
         }
-        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, newPoints);
-    }
 
 #ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
+        // Suspect Emscripten won't be emitting 64-bit code for a while yet,
+        // but want to make sure this continues to work even if they do.
+        setGLBufferData(newPoints, numberOfPoints * sizeof(ccVertex2F));
+        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, newPoints);
 #endif // EMSCRIPTEN
+    }
+
     glDrawArrays(GL_POINTS, 0, (GLsizei) numberOfPoints);
 
     CC_SAFE_DELETE_ARRAY(newPoints);
@@ -169,9 +208,11 @@ void ccDrawLine( const CCPoint& origin, const CCPoint& destination )
     s_pShader->setUniformLocationWith4fv(s_nColorLocation, (GLfloat*) &s_tColor.r, 1);
 
     ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );
-    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
+    setGLBufferData(vertices, 16);
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #endif // EMSCRIPTEN
     glDrawArrays(GL_LINES, 0, 2);
 
@@ -208,13 +249,15 @@ void ccDrawPoly( const CCPoint *poli, unsigned int numberOfPoints, bool closePol
 
     ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );
 
-#ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
-#endif // EMSCRIPTEN
     // iPhone and 32-bit machines optimization
     if( sizeof(CCPoint) == sizeof(ccVertex2F) )
     {
+#ifdef EMSCRIPTEN
+        setGLBufferData((void*) poli, numberOfPoints * sizeof(CCPoint));
+        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
         glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, poli);
+#endif // EMSCRIPTEN
 
         if( closePolygon )
             glDrawArrays(GL_LINE_LOOP, 0, (GLsizei) numberOfPoints);
@@ -230,7 +273,12 @@ void ccDrawPoly( const CCPoint *poli, unsigned int numberOfPoints, bool closePol
             newPoli[i].x = poli[i].x;
             newPoli[i].y = poli[i].y;
         }
+#ifdef EMSCRIPTEN
+        setGLBufferData(newPoli, numberOfPoints * sizeof(ccVertex2F));
+        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
         glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, newPoli);
+#endif // EMSCRIPTEN
 
         if( closePolygon )
             glDrawArrays(GL_LINE_LOOP, 0, (GLsizei) numberOfPoints);
@@ -259,7 +307,12 @@ void ccDrawSolidPoly( const CCPoint *poli, unsigned int numberOfPoints, ccColor4
     // iPhone and 32-bit machines optimization
     if( sizeof(CCPoint) == sizeof(ccVertex2F) )
     {
+#ifdef EMSCRIPTEN
+        setGLBufferData((void*) poli, numberOfPoints * sizeof(CCPoint));
+        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
         glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, poli);
+#endif // EMSCRIPTEN
     }
     else
     {
@@ -268,12 +321,14 @@ void ccDrawSolidPoly( const CCPoint *poli, unsigned int numberOfPoints, ccColor4
         {
             newPoli[i] = vertex2( poli[i].x, poli[i].y );
         }
+#ifdef EMSCRIPTEN
+        setGLBufferData(newPoli, numberOfPoints * sizeof(ccVertex2F));
+        glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
         glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, newPoli);
+#endif // EMSCRIPTEN
     }    
 
-#ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
-#endif // EMSCRIPTEN
     glDrawArrays(GL_TRIANGLE_FAN, 0, (GLsizei) numberOfPoints);
 
     CC_SAFE_DELETE_ARRAY(newPoli);
@@ -311,9 +366,11 @@ void ccDrawCircle( const CCPoint& center, float radius, float angle, unsigned in
 
     ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );
 
-    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
+    setGLBufferData(vertices, sizeof(GLfloat)*2*(segments+2));
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #endif // EMSCRIPTEN
     glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments+additionalSegment);
 
@@ -349,9 +406,11 @@ void ccDrawQuadBezier(const CCPoint& origin, const CCPoint& control, const CCPoi
 
     ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );
 
-    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
+    setGLBufferData(vertices, (segments + 1) * sizeof(ccVertex2F));
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #endif // EMSCRIPTEN
     glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments + 1);
     CC_SAFE_DELETE_ARRAY(vertices);
@@ -404,9 +463,11 @@ void ccDrawCardinalSpline( CCPointArray *config, float tension,  unsigned int se
 
     ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );
 
-    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
+    setGLBufferData(vertices, (segments + 1) * sizeof(ccVertex2F));
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #endif // EMSCRIPTEN
     glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments + 1);
 
@@ -436,9 +497,11 @@ void ccDrawCubicBezier(const CCPoint& origin, const CCPoint& control1, const CCP
 
     ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );
 
-    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #ifdef EMSCRIPTEN
-    printf("WARNING: %s does not have client-side buffer fix for Emscripten\n", __func__);
+    setGLBufferData(vertices, (segments + 1) * sizeof(ccVertex2F));
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
 #endif // EMSCRIPTEN
     glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments + 1);
     CC_SAFE_DELETE_ARRAY(vertices);