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-rw-r--r--src/vertex-clipping.c70
1 files changed, 34 insertions, 36 deletions
diff --git a/src/vertex-clipping.c b/src/vertex-clipping.c
index 603ce6f4..db527e14 100644
--- a/src/vertex-clipping.c
+++ b/src/vertex-clipping.c
@@ -23,18 +23,16 @@
#include <float.h>
#include <math.h>
-#include <GLES2/gl2.h>
-
#include "vertex-clipping.h"
-GLfloat
-float_difference(GLfloat a, GLfloat b)
+float
+float_difference(float a, float b)
{
/* http://www.altdevblogaday.com/2012/02/22/comparing-floating-point-numbers-2012-edition/ */
- static const GLfloat max_diff = 4.0f * FLT_MIN;
- static const GLfloat max_rel_diff = 4.0e-5;
- GLfloat diff = a - b;
- GLfloat adiff = fabsf(diff);
+ static const float max_diff = 4.0f * FLT_MIN;
+ static const float max_rel_diff = 4.0e-5;
+ float diff = a - b;
+ float adiff = fabsf(diff);
if (adiff <= max_diff)
return 0.0f;
@@ -50,12 +48,12 @@ float_difference(GLfloat a, GLfloat b)
/* A line segment (p1x, p1y)-(p2x, p2y) intersects the line x = x_arg.
* Compute the y coordinate of the intersection.
*/
-static GLfloat
-clip_intersect_y(GLfloat p1x, GLfloat p1y, GLfloat p2x, GLfloat p2y,
- GLfloat x_arg)
+static float
+clip_intersect_y(float p1x, float p1y, float p2x, float p2y,
+ float x_arg)
{
- GLfloat a;
- GLfloat diff = float_difference(p1x, p2x);
+ float a;
+ float diff = float_difference(p1x, p2x);
/* Practically vertical line segment, yet the end points have already
* been determined to be on different sides of the line. Therefore
@@ -72,12 +70,12 @@ clip_intersect_y(GLfloat p1x, GLfloat p1y, GLfloat p2x, GLfloat p2y,
/* A line segment (p1x, p1y)-(p2x, p2y) intersects the line y = y_arg.
* Compute the x coordinate of the intersection.
*/
-static GLfloat
-clip_intersect_x(GLfloat p1x, GLfloat p1y, GLfloat p2x, GLfloat p2y,
- GLfloat y_arg)
+static float
+clip_intersect_x(float p1x, float p1y, float p2x, float p2y,
+ float y_arg)
{
- GLfloat a;
- GLfloat diff = float_difference(p1y, p2y);
+ float a;
+ float diff = float_difference(p1y, p2y);
/* Practically horizontal line segment, yet the end points have already
* been determined to be on different sides of the line. Therefore
@@ -99,32 +97,32 @@ enum path_transition {
};
static void
-clip_append_vertex(struct clip_context *ctx, GLfloat x, GLfloat y)
+clip_append_vertex(struct clip_context *ctx, float x, float y)
{
*ctx->vertices.x++ = x;
*ctx->vertices.y++ = y;
}
static enum path_transition
-path_transition_left_edge(struct clip_context *ctx, GLfloat x, GLfloat y)
+path_transition_left_edge(struct clip_context *ctx, float x, float y)
{
return ((ctx->prev.x >= ctx->clip.x1) << 1) | (x >= ctx->clip.x1);
}
static enum path_transition
-path_transition_right_edge(struct clip_context *ctx, GLfloat x, GLfloat y)
+path_transition_right_edge(struct clip_context *ctx, float x, float y)
{
return ((ctx->prev.x < ctx->clip.x2) << 1) | (x < ctx->clip.x2);
}
static enum path_transition
-path_transition_top_edge(struct clip_context *ctx, GLfloat x, GLfloat y)
+path_transition_top_edge(struct clip_context *ctx, float x, float y)
{
return ((ctx->prev.y >= ctx->clip.y1) << 1) | (y >= ctx->clip.y1);
}
static enum path_transition
-path_transition_bottom_edge(struct clip_context *ctx, GLfloat x, GLfloat y)
+path_transition_bottom_edge(struct clip_context *ctx, float x, float y)
{
return ((ctx->prev.y < ctx->clip.y2) << 1) | (y < ctx->clip.y2);
}
@@ -132,9 +130,9 @@ path_transition_bottom_edge(struct clip_context *ctx, GLfloat x, GLfloat y)
static void
clip_polygon_leftright(struct clip_context *ctx,
enum path_transition transition,
- GLfloat x, GLfloat y, GLfloat clip_x)
+ float x, float y, float clip_x)
{
- GLfloat yi;
+ float yi;
switch (transition) {
case PATH_TRANSITION_IN_TO_IN:
@@ -163,9 +161,9 @@ clip_polygon_leftright(struct clip_context *ctx,
static void
clip_polygon_topbottom(struct clip_context *ctx,
enum path_transition transition,
- GLfloat x, GLfloat y, GLfloat clip_y)
+ float x, float y, float clip_y)
{
- GLfloat xi;
+ float xi;
switch (transition) {
case PATH_TRANSITION_IN_TO_IN:
@@ -193,7 +191,7 @@ clip_polygon_topbottom(struct clip_context *ctx,
static void
clip_context_prepare(struct clip_context *ctx, const struct polygon8 *src,
- GLfloat *dst_x, GLfloat *dst_y)
+ float *dst_x, float *dst_y)
{
ctx->prev.x = src->x[src->n - 1];
ctx->prev.y = src->y[src->n - 1];
@@ -203,7 +201,7 @@ clip_context_prepare(struct clip_context *ctx, const struct polygon8 *src,
static int
clip_polygon_left(struct clip_context *ctx, const struct polygon8 *src,
- GLfloat *dst_x, GLfloat *dst_y)
+ float *dst_x, float *dst_y)
{
enum path_transition trans;
int i;
@@ -219,7 +217,7 @@ clip_polygon_left(struct clip_context *ctx, const struct polygon8 *src,
static int
clip_polygon_right(struct clip_context *ctx, const struct polygon8 *src,
- GLfloat *dst_x, GLfloat *dst_y)
+ float *dst_x, float *dst_y)
{
enum path_transition trans;
int i;
@@ -235,7 +233,7 @@ clip_polygon_right(struct clip_context *ctx, const struct polygon8 *src,
static int
clip_polygon_top(struct clip_context *ctx, const struct polygon8 *src,
- GLfloat *dst_x, GLfloat *dst_y)
+ float *dst_x, float *dst_y)
{
enum path_transition trans;
int i;
@@ -251,7 +249,7 @@ clip_polygon_top(struct clip_context *ctx, const struct polygon8 *src,
static int
clip_polygon_bottom(struct clip_context *ctx, const struct polygon8 *src,
- GLfloat *dst_x, GLfloat *dst_y)
+ float *dst_x, float *dst_y)
{
enum path_transition trans;
int i;
@@ -272,8 +270,8 @@ clip_polygon_bottom(struct clip_context *ctx, const struct polygon8 *src,
int
clip_simple(struct clip_context *ctx,
struct polygon8 *surf,
- GLfloat *ex,
- GLfloat *ey)
+ float *ex,
+ float *ey)
{
int i;
for (i = 0; i < surf->n; i++) {
@@ -286,8 +284,8 @@ clip_simple(struct clip_context *ctx,
int
clip_transformed(struct clip_context *ctx,
struct polygon8 *surf,
- GLfloat *ex,
- GLfloat *ey)
+ float *ex,
+ float *ey)
{
struct polygon8 polygon;
int i, n;
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