GLES-Render.mm
上传用户:gb3593
上传日期:2022-01-07
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文件大小:4k
- /*
- * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
- *
- * iPhone port by Simon Oliver - http://www.simonoliver.com - http://www.handcircus.com
- *
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event will the authors be held liable for any damages
- * arising from the use of this software.
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- * 1. The origin of this software must not be misrepresented; you must not
- * claim that you wrote the original software. If you use this software
- * in a product, an acknowledgment in the product documentation would be
- * appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- * misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
- #include "GLES-Render.h"
- #include <cstdio>
- #include <cstdarg>
- #include <cstring>
- void GLESDebugDraw::DrawPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color)
- {
- glColor4f(color.r, color.g, color.b,1);
- glVertexPointer(2, GL_FLOAT, 0, vertices);
- glDrawArrays(GL_LINE_LOOP, 0, vertexCount);
- }
- void GLESDebugDraw::DrawSolidPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color)
- {
- glVertexPointer(2, GL_FLOAT, 0, vertices);
-
- glColor4f(color.r, color.g, color.b,0.5f);
- glDrawArrays(GL_TRIANGLE_FAN, 0, vertexCount);
-
- glColor4f(color.r, color.g, color.b,1);
- glDrawArrays(GL_LINE_LOOP, 0, vertexCount);
- }
- void GLESDebugDraw::DrawCircle(const b2Vec2& center, float32 radius, const b2Color& color)
- {
- const float32 k_segments = 16.0f;
- int vertexCount=16;
- const float32 k_increment = 2.0f * b2_pi / k_segments;
- float32 theta = 0.0f;
-
- GLfloat glVertices[vertexCount*2];
- for (int32 i = 0; i < k_segments; ++i)
- {
- b2Vec2 v = center + radius * b2Vec2(cosf(theta), sinf(theta));
- glVertices[i*2]=v.x;
- glVertices[i*2+1]=v.y;
- theta += k_increment;
- }
-
- glColor4f(color.r, color.g, color.b,1);
- glVertexPointer(2, GL_FLOAT, 0, glVertices);
-
- glDrawArrays(GL_TRIANGLE_FAN, 0, vertexCount);
- }
- void GLESDebugDraw::DrawSolidCircle(const b2Vec2& center, float32 radius, const b2Vec2& axis, const b2Color& color)
- {
- const float32 k_segments = 16.0f;
- int vertexCount=16;
- const float32 k_increment = 2.0f * b2_pi / k_segments;
- float32 theta = 0.0f;
-
- GLfloat glVertices[vertexCount*2];
- for (int32 i = 0; i < k_segments; ++i)
- {
- b2Vec2 v = center + radius * b2Vec2(cosf(theta), sinf(theta));
- glVertices[i*2]=v.x;
- glVertices[i*2+1]=v.y;
- theta += k_increment;
- }
-
- glColor4f(color.r, color.g, color.b,0.5f);
- glVertexPointer(2, GL_FLOAT, 0, glVertices);
- glDrawArrays(GL_TRIANGLE_FAN, 0, vertexCount);
- glColor4f(color.r, color.g, color.b,1);
- glDrawArrays(GL_LINE_LOOP, 0, vertexCount);
-
- // Draw the axis line
- DrawSegment(center,center+radius*axis,color);
- }
- void GLESDebugDraw::DrawSegment(const b2Vec2& p1, const b2Vec2& p2, const b2Color& color)
- {
- glColor4f(color.r, color.g, color.b,1);
- GLfloat glVertices[] = {
- p1.x,p1.y,p2.x,p2.y
- };
- glVertexPointer(2, GL_FLOAT, 0, glVertices);
- glDrawArrays(GL_LINES, 0, 2);
- }
- void GLESDebugDraw::DrawTransform(const b2Transform& xf)
- {
- b2Vec2 p1 = xf.position, p2;
- const float32 k_axisScale = 0.4f;
- p2 = p1 + k_axisScale * xf.R.col1;
- DrawSegment(p1,p2,b2Color(1,0,0));
-
- p2 = p1 + k_axisScale * xf.R.col2;
- DrawSegment(p1,p2,b2Color(0,1,0));
- }
- void GLESDebugDraw::DrawPoint(const b2Vec2& p, float32 size, const b2Color& color)
- {
- glColor4f(color.r, color.g, color.b,1);
- glPointSize(size);
- GLfloat glVertices[] = {
- p.x,p.y
- };
- glVertexPointer(2, GL_FLOAT, 0, glVertices);
- glDrawArrays(GL_POINTS, 0, 1);
- glPointSize(1.0f);
- }
- void GLESDebugDraw::DrawString(int x, int y, const char *string, ...)
- {
- /* Unsupported as yet. Could replace with bitmap font renderer at a later date */
- }
- void GLESDebugDraw::DrawAABB(b2AABB* aabb, const b2Color& c)
- {
-
- glColor4f(c.r, c.g, c.b,1);
- GLfloat glVertices[] = {
- aabb->lowerBound.x, aabb->lowerBound.y,
- aabb->upperBound.x, aabb->lowerBound.y,
- aabb->upperBound.x, aabb->upperBound.y,
- aabb->lowerBound.x, aabb->upperBound.y
- };
- glVertexPointer(2, GL_FLOAT, 0, glVertices);
- glDrawArrays(GL_LINE_LOOP, 0, 8);
-
- }