X-Git-Url: https://git.lukelau.me/?p=opengl.git;a=blobdiff_plain;f=util.cpp;fp=util.cpp;h=796017d8fb31f67b316667ed61ee4c1e7e279191;hp=0000000000000000000000000000000000000000;hb=dbd855720a9af7d6e599ddc50bbbb0dee85458a5;hpb=9e2f64944d28b5e050e37d9995ffeb3dd4cb5b7a

diff --git a/util.cpp b/util.cpp
new file mode 100644
index 0000000..796017d
--- /dev/null
+++ b/util.cpp
@@ -0,0 +1,47 @@
+#include <GL/glew.h>
+#include <glm/ext.hpp>
+#include "shapes.hpp"
+#include "util.hpp"
+
+GLuint utilVao;
+Program *utilProg;
+
+Program *getUtilProg() { return utilProg; }
+
+void initUtilProg() {
+	utilProg = new Program("plainvertex.glsl", "plainfrag.glsl");
+
+	glGenVertexArrays(1, &utilVao);
+	GLuint vbo;
+	glBindVertexArray(utilVao);
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(pyramid), pyramid, GL_STATIC_DRAW);
+	GLuint posLoc = glGetAttribLocation(utilProg->progId, "vPosition");
+	glEnableVertexAttribArray(posLoc);
+	glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
+
+	if (glGetError()) abort();
+}
+
+void drawDebugNode(glm::mat4 model, glm::vec4 color) {
+	GLint prevProg; glGetIntegerv(GL_CURRENT_PROGRAM, &prevProg);
+
+  	glUseProgram(utilProg->progId);
+
+	glDepthRange(0, 0.01);
+
+	glBindVertexArray(utilVao);
+	model = glm::scale(model, {0.1, 0.3, 0.1});
+	GLuint modelLoc = glGetUniformLocation(utilProg->progId, "model");
+	glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+
+	GLuint colorLoc = glGetUniformLocation(utilProg->progId, "color");
+	glUniform4fv(colorLoc, 1, glm::value_ptr(color));
+		
+	glDrawArrays(GL_TRIANGLES, 0, 36);
+
+	glDepthRange(0, 1.f);
+
+	glUseProgram(prevProg);
+}