Blending of zlayers functionality copied to NOMADVRLib

NOMADVRLib/IsoShaders.cpp

@@ -102,7 +102,7 @@ const char *const IsoTransparentShaders [] = {"Iso Transparent Renderer",
 	nullptr
 };
 
-const char *const IsoBlendShaders [] = {
+const char *const IsoBlendShaders [] = {"Iso Transparent Blend",
 // vertex shader
 #if defined(WIN32) || defined(CAVE)
 	"#version 410 core\n"
@@ -110,13 +110,13 @@ const char *const IsoBlendShaders [] = {
 	"#version 300 es\n"
 #endif
 	"uniform mat4 matrix;\n"
-	"layout(location = 0) in vec4 position;\n"
+	"layout(location = 0) in vec3 position;\n"
 	"layout(location = 1) in vec2 v2TexCoordsIn;\n"
 	"out vec2 v2TexCoord;\n"
 	"void main()\n"
 	"{\n"
 	"	v2TexCoord = v2TexCoordsIn;\n"
-	"	gl_Position = matrix * vec4(position.xyz, 1);\n"
+	"	gl_Position = matrix * vec4(position, 1);\n"
 	"}\n",
 	//fragment shader
 	"#version 410 core\n"

NOMADVRLib/IsosurfacesGL.cpp

@@ -346,4 +346,63 @@ glDepthMask(GL_TRUE);
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 return glGetError();
 }
+
+GLenum SetupBlending (GLuint *vao, GLuint *vertex, GLuint *indices)
+{
+	float z = 0.0f; //(m_fNearClip + m_fFarClip) / 2.0f;
+	const float points[] = {
+		-1, -1, z, 0, 0,
+		-1, 1, z, 0, 1,
+		1, 1, z, 1, 1,
+		1, -1, z, 1, 0 };
+	glGenVertexArrays(1, myvao);
+	glBindVertexArray(*myvao);
+	glGenBuffers(1, vertex);
+	glBindBuffer(GL_ARRAY_BUFFER, *vertex);
+	glBufferData(GL_ARRAY_BUFFER, 4 * 5 * sizeof(GLfloat), points, GL_STATIC_DRAW);
+	if ((e = glGetError()) != GL_NO_ERROR)
+		eprintf("Gl error after glBufferData: %d, %s, l %d\n", e, gluErrorString(e), __LINE__);
+	glEnableVertexAttribArray(0);
+	glEnableVertexAttribArray(1);
+	glDisableVertexAttribArray(2);
+	glDisableVertexAttribArray(3);
+	if ((e = glGetError()) != GL_NO_ERROR)
+		eprintf("Gl error: %d, %s, l %d\n", e, gluErrorString(e), __LINE__);
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
+	if ((e = glGetError()) != GL_NO_ERROR)
+		eprintf("Gl error: %d, %s, l %d\n", e, gluErrorString(e), __LINE__); 
+	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
+	if ((e = glGetError()) != GL_NO_ERROR)
+		eprintf("Gl error: %d, %s, l %d\n", e, gluErrorString(e), __LINE__);
+
+	glGenBuffers(1, index);
+	if ((e = glGetError()) != GL_NO_ERROR)
+		eprintf("Gl error: %d, %s, l %d\n", e, gluErrorString(e), __LINE__);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, *index);
+	if ((e = glGetError()) != GL_NO_ERROR)
+		eprintf("Gl error: %d, %s, l %d\n", e, gluErrorString(e), __LINE__);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(iData), iData, GL_STATIC_DRAW);
+
+	if ((e = glGetError()) != GL_NO_ERROR)
+		eprintf("Gl error: %d, %s, l %d\n", e, gluErrorString(e), __LINE__);
+	return e;
+}
+
+void DeleteBlendingBuffers(GLuint *vao, GLuint *vertex, GLuint *indices)
+{
+	glDeleteBuffers(1, vertex);
+	glDeleteBuffers(1, indices);
+	glDeleteVertexArrays(1, vao);
+}
+
+void BlendTextures(GLuint textures)
+{
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	for (int zl = ZLAYERS - 1; zl >= 0; zl--) {
+		glBindTexture(GL_TEXTURE_2D, textures[2 + zl]);
+		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+	}
+}
 #endif